c program help :>

This is a discussion on c program help :> within the C Programming forums, part of the General Programming Boards category; I need help with figuring out an assignment I have to do.. I can't figure out how to make the ...

  1. #1
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    c program help :>

    I need help with figuring out an assignment I have to do.. I can't figure out how to make the program check for the difference between classic car and miles as well as do the other things it already is doing. I Just need to get to the right direction, can't quite figure out what I haven't done yet or I am doing wrong..

    Here's the question:
    There are many factors to consider before purchasing a used car.
    Three major factors that affect the ultimate selling price of a
    used car are:

    Make (manufacturer), Year, and the number of Kilometers or Miles the
    car has been driven.

    Specifications:
    For your first programming assignment this semester, you are to write a
    C program that helps customers estimate the selling price of a used car
    based on the factors listed above for a select number of automobile
    manufacturers (see table below).

    Make Depreciation/Year Depreciation/Kilometer
    ---------- ----------------- ---------------
    Porsche $ 650.00 $0.03
    Chevrolet $1950.00 $0.11
    Volkswagon $1700.00 $0.08
    BMW $ 950.00 $0.05
    Audi $1200.00 $0.06
    Honda $1350.00 $0.07
    Ford $2100.00 $0.09
    Mercedes $ 875.00 $0.05

    Depreciation (the decrease in value) of an automobile occurs both by
    year AND by kilometers driven. (eg.) A 1 year old Porsche that has been driven
    5 kilometers will depreciate by $650.15 (1 * 650.00 + 5 * 0.03).

    Your program should begin by asking the user for five pieces of data:

    1. The current year (a whole number),
    2. The make of the USED car (a whole number),

    1 for Porsche,
    2 for Chevrolet,
    3 for Volkswagon,
    4 for BMW,
    5 for Audi,
    6 for Honda,
    7 for Ford,
    8 for Mercedes

    3. The year the car was manufactured (a whole number),

    4. The original selling price (M.S.R.P.) of the car
    (a floating point number),

    5. The number of kilometers or miles (Odometer reading)
    the car has been driven (a whole number).

    NOTE: Because they are manufactured in the U.S., if the make chosen by the
    user is 2 (Chevrolet) or 7 (Ford), you are to ask the user how many
    "Miles" the car has been driven, otherwise you are to ask the user for
    the number of Kilometers.

    Also, the above table lists distance depreciation values in
    $Dollars per Kilometer therefore be careful when calculating totals for
    automobiles that have their odometer reading entered in Miles.
    You may assume that 1 Mile = 1.6 KM.

    Your program should then process the information, perform the necessary
    calculations, and display for the user, what the estimated selling price
    of the car is (in the following format):

    Automobile Information:
    Make: [Make]
    Year: [Year]
    Odometer: [Kilometers or Miles]
    Depreciation: [dispayed as a percentage (%)]

    Selling Price: $[Estimated Cost of Used Car]
    Tax: $[GST (5%) and PST (8%)]
    ----------
    Total: $[Final selling price]

    Where Make, Year, and Kilometers or Miles are the values entered
    by the user, and Depreciation (percentage of the original
    value the car has depreciated before tax), Selling Price, Tax,
    and Total (Selling Price + Tax) are all calculated values.
    If the final selling price of ANY vehicle is less than or
    equal to $0.00, you are not to display any of this
    information, but instead are to display ONLY the following line:

    "I wouldn't buy this car if I were you!!!"

    In addition, because some car makes (and then, only certain
    years within those Make's) are considered to be "classic's"
    (since so few of those cars were manufactured), the ultimate
    value of these cars will depreciate as follows:

    + Classic automobiles will only depreciate by the amount of
    Kilometers driven at a rate equal to 1/2 (one half) of that listed
    in the chart above, and will not depreciate by Year,
    regardless of how old they are!

    + In addition, $10,000 is to be added to the final selling
    price only after depreciation calculations have been performed,
    but before both the percent depreciation and tax amounts are
    calculated. If after the depreciation calculations have been
    performed on a classic car, you determine that the selling price
    is less than or equal to $0.00, then the selling price of that
    classic car (before tax) should be set to $10,000.00
    Thus, a "classic" car can never be worth less than $10,000.00
    regardless of the number of Kilometers or Miles it has been driven
    or how old it is!

    + Classic automobile makes (and years within those makes) are:
    Porsche (1948, 1963 and 1965)
    Chevrolet (1955 and 1957)
    Ford (1931, 1957, 1964, and 1965)
    BMW (1955)

    (eg.) A 1948 Porsche is a "classic", but a 1949 Porsche is not!
    (eg.) For BMW's, only those manufactured in 1955 would be considered
    to be classic.

    If the car is a classic, an extra line of output should be
    displayed notifying the user of this fact. Also, because
    classic cars have $10,000.00 added to their selling price,
    it will be possible to have a negative depreciation
    indicating that the vehicle has actually appreciated
    (increased in value from it's original selling price!!!).


    ****** NOTICE: ******
    You may assume that only correct data (positive and numeric) will be
    entered. No data validation will be required.
    Also, because of the rounding that occurs with C floating point
    values, if the figures generated by your working C program
    differ by 1 or 2 cents, this should not be considered significant
    and can be ignored!

    A few sample runs of the program should look like this:
    $ a.out
    Used Car Estimator Program [UCEP]
    Enter the current Year: 2010
    Vehicle Make:
    1 for Porsche,
    2 for Chevrolet,
    3 for Volkswagon,
    4 for BMW,
    5 for Audi,
    6 for Honda,
    7 for Ford,
    8 for Mercedes
    Enter choioce: 1
    Enter the vehicle Year: 2003
    Enter the vehicle's original selling price (M.S.R.P.): 70000.00
    Enter the Kilometers driven: 12000

    Automobile Information:
    Make: Porsche
    Year: 2003
    Odometer: 12000
    Depreciation: 7.01%

    Selling Price: $65090.00
    Tax: $ 8461.70
    ----------
    Total: $73551.70


    $ a.out
    Used Car Estimator Program [UCEP]
    Enter the current Year: 2010
    Vehicle Make:
    1 for Porsche,
    2 for Chevrolet,
    3 for Volkswagon,
    4 for BMW,
    5 for Audi,
    6 for Honda,
    7 for Ford,
    8 for Mercedes
    Enter choice: 3
    Enter the vehicle Year: 2001
    Enter the vehicle's original selling price (M.S.R.P.): 31500.00
    Enter the Kilometers driven: 65267

    Automobile Information:
    Make: Volkswagon
    Year: 2001
    Odometer: 65267
    Depreciation: 65.15%

    Selling Price: $10978.64
    Tax: $ 1427.22
    ----------
    Total: $12405.86


    $ a.out
    Used Car Estimator Program [UCEP]
    Enter the current Year: 2010
    Vehicle Make:
    1 for Porsche,
    2 for Chevrolet,
    3 for Volkswagon,
    4 for BMW,
    5 for Audi,
    6 for Honda,
    7 for Ford,
    8 for Mercedes
    Enter choice: 7
    Enter the vehicle Year: 1965
    Enter the vehicle's original selling price (M.S.R.P.): 1950.00
    Enter the Miles driven: 5267

    Automobile Information:
    Make: Ford
    Year: 1965
    Odometer: 5267
    Depreciation: -493.37%

    Price: $11570.78
    Tax: $ 1504.20
    ----------
    Total: $13074.98

    This car is a CLASSIC!


    $ a.out
    Used Car Estimator Program [UCEP]
    Enter the current Year: 2010
    Vehicle Make:
    1 for Porsche
    2 for Chevrolet
    3 for Volkswagon
    4 for BMW
    5 for Audi
    6 for Ford
    7 for Mercedes
    Enter choice: 2
    Enter the vehicle Year: 1979
    Enter the vehicle's original selling price (M.S.R.P.): 11500.00
    Enter the Miles driven: 324689

    I wouldn't buy this car if I were you!!!
    --------------
    Here's what I've managed so far:
    Code:
    #include <stdio.h>
    #include <string.h>
    
    int main () {
        int cur_year, year_man, year_used, make_car, odo;
        char make_carname[15];
        double msrp, depreciation, dpy, dpk, depreciation_p, sell_price, gst, pst, tax, total;
       
        printf("Used Car Estimator Program [UCEP]\nEnter the current Year: ");
        scanf("%d", &cur_year);
        printf("Vehicle Make:\n1 for Porsche,\n2 for Chevrolet,\n3 for Volkswagon,\n4 for BMW,\n5 for Audi,\n6 for Honda,\n7 for Ford,\n8 for Mercedes\nEnter choice: ");
        scanf("%d", &make_car);
        printf("Enter the vehicle Year: ");
        scanf("%d", &year_man);
        printf("Enter the vehicle's original selling price (M.S.R.P.): ");
        scanf("%lf", &msrp);
    
        switch (make_car) {
            case 1:
                strcpy(make_carname, "Porsche");
                printf("Enter the Kilometers driven: ");
                scanf("%d", &odo);
                dpy = 650.00, dpk = 0.03;
                break;
    
            case 2:
                strcpy(make_carname, "Chevrolet");
                printf("Enter the Miles driven: ");
                scanf("%d", &odo);
                dpy = 1950.00, dpk = 0.11 * 0.62;
                break;
    
            case 3:
                strcpy(make_carname, "Volkswagon");
                printf("Enter the Kilometers driven: ");
                scanf("%d", &odo);
                dpy = 1700.00, dpk = 0.08;
                break;
    
            case 4:
                strcpy(make_carname, "BMW");
                printf("Enter the Kilometers driven: ");
                scanf("%d", &odo);
                dpy = 950.00, dpk = 0.05;
                break;
    
            case 5:
                strcpy(make_carname, "Audi");
                printf("Enter the Kilometers driven: ");
                scanf("%d", &odo);
                dpy = 1200.00, dpk = 0.06;
                break;
    
            case 6:
                strcpy(make_carname, "Honda");
                printf("Enter the Kilometers driven: ");
                scanf("%d", &odo);
                dpy = 1350.00, dpk = 0.07;
                break;
    
            case 7:
                strcpy(make_carname, "Ford");
                printf("Enter the Miles driven: ");
                scanf("%d", &odo);
                dpy = 2100.00, dpk = 0.04 * 0.62;
                break;
    
            case 8:
                strcpy(make_carname, "Mercedes");
                printf("Enter the Kilometers driven: ");
                scanf("%d", &odo);
                dpy = 875.00, dpk = 0.05;
                break;
           
            default:
                printf("filler\n");
        }
    
            year_used = cur_year - year_man;   
            depreciation = /*(year_used * dpy) + */(odo * dpk);
            sell_price = 10000 + (msrp - depreciation);
            depreciation_p = depreciation / msrp * 100;
            gst = sell_price / 100 * 5;
            pst = sell_price / 100 * 8;
            tax = gst + pst;
            total = sell_price + tax;
           
            if (make_car == 1 && total >= 0.00) {
                printf("\nAutomobile Information:\nMake:        %s\nYear:        %d\n", make_carname, year_man);
                printf("Odometer:      %d\n", odo);
                printf("Depreciation:      %.2lf%%\n", depreciation_p);
                printf("\nPrice:          $%.2lf\n", sell_price);
                printf("Tax:            $%.2f\n", tax);
                printf("                ---------\n");
                printf("Total:          $%.2lf\n", total);
            }
            else if (make_car == 2 && total >= 0.00) {
                printf("\nAutomobile Information:\nMake:        %s\nYear:        %d\n", make_carname, year_man);
                printf("Odometer:      %d\n", odo);
                printf("Depreciation:      %.2lf%%\n", depreciation_p);
                printf("\nPrice:          $%.2lf\n", sell_price);
                printf("Tax:            $%.2f\n", tax);
                printf("                ---------\n");
                printf("Total:          $%.2lf\n", total);
            }
            else if (make_car == 3 && total >= 0.00) {
                printf("\nAutomobile Information:\nMake:        %s\nYear:        %d\n", make_carname, year_man);
                printf("Odometer:      %d\n", odo);
                printf("Depreciation:      %.2lf%%\n", depreciation_p);
                printf("\nPrice:          $%.2lf\n", sell_price);
                printf("Tax:            $%.2f\n", tax);
                printf("                ---------\n");
                printf("Total:          $%.2lf\n", total);
            }
            else if (make_car == 4 && total >= 0.00) {
                printf("\nAutomobile Information:\nMake:        %s\nYear:        %d\n", make_carname, year_man);
                printf("Odometer:      %d\n", odo);
                printf("Depreciation:      %.2lf%%\n", depreciation_p);
                printf("\nPrice:          $%.2lf\n", sell_price);
                printf("Tax:            $%.2f\n", tax);
                printf("                ---------\n");
                printf("Total:          $%.2lf\n", total);
            }
            else if (make_car == 5 && total >= 0.00) {
                printf("\nAutomobile Information:\nMake:        %s\nYear:        %d\n", make_carname, year_man);
                printf("Odometer:      %d\n", odo);
                printf("Depreciation:      %.2lf%%\n", depreciation_p);
                printf("\nPrice:          $%.2lf\n", sell_price);
                printf("Tax:            $%.2f\n", tax);
                printf("                ---------\n");
                printf("Total:          $%.2lf\n", total);
            }       
            else if (make_car == 6 && total >= 0.00) {
                printf("\nAutomobile Information:\nMake:        %s\nYear:        %d\n", make_carname, year_man);
                printf("Odometer:      %d\n", odo);
                printf("Depreciation:      %.2lf%%\n", depreciation_p);
                printf("\nPrice:          $%.2lf\n", sell_price);
                printf("Tax:            $%.2f\n", tax);
                printf("                ---------\n");
                printf("Total:          $%.2lf\n", total);
            }       
            else if (make_car == 7 && total >= 0.00) {
                printf("\nAutomobile Information:\nMake:        %s\nYear:        %d\n", make_carname, year_man);
                printf("Odometer:      %d\n", odo);
                printf("Depreciation:      %.2lf%%\n", depreciation_p);
                printf("\nPrice:          $%.2lf\n", sell_price);
                printf("Tax:            $%.2f\n", tax);
                printf("                ---------\n");
                printf("Total:          $%.2lf\n", total);
            }       
            else if (make_car == 8 && total >= 0.00) {
                printf("\nAutomobile Information:\nMake:        %s\nYear:        %d\n", make_carname, year_man);
                printf("Odometer:      %d\n", odo);
                printf("Depreciation:      %.2lf%%\n", depreciation_p);
                printf("\nPrice:          $%.2lf\n", sell_price);
                printf("Tax:            $%.2f\n", tax);
                printf("                ---------\n");
                printf("Total:          $%.2lf\n", total);
            }
            else {
                printf("\nI wouldn't buy this car if I were you!!!\n");
            }
           
            printf("\n\nDEBUG MODE:\n\n year_used: %d\n make_car: %d\n make_carname: %s\n year_man: %d\n odo: %d\n depreciation: %.2lf\n depreciation_p: %.2lf%%\n sell_price: $%.2lf\n tax: $%.2lf\n total: $%.2lf\n", year_used, make_car, make_carname, year_man, odo, depreciation, depreciation_p, sell_price, tax, total);
            getchar ();
        return 0;
    }
    Btw, only methods we've learned so far are :
    if..elseif..s, switch, for loop...while.. loop... do while loop.. ...

    so, can't really understand any other advanced methods....

    Thanks for the help!

  2. #2
    Registered User
    Join Date
    Sep 2006
    Posts
    8,868
    So what's wrong with your program? Don't waste our time here.

    You figure out your assignment, and we will help you with the program - that's the deal. Be specific what you need help with. Our crystal ball is in the shop for repairs.

  3. #3
    a_capitalist_story
    Join Date
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    Posts
    2,655
    https://cs.senecac.on.ca/~ipc144/

    Cheating and/or Plagiarism:

    For a first offence you will be given a grade of 'F' for the test or assignment on which you cheated and it will be recorded in your personnel file. For a second offence the penalty will be a failure in the course and you will be expelled from the college.
    Does this qualify?

  4. #4
    Registered User
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    no, since i'm not asking you guys to make the program work instead of me lol.

    Just simply need to understand how to include the classic car check in the program without fking it up.. been trying by adding more ifs and even tried combining the switch and if statements into 1 single if statement, can't make it work yet

    need a push to the right direction thats all.
    Last edited by n2134; 02-05-2010 at 10:16 PM.

  5. #5
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    wit hthe above program and after removing the comments..

    Code:
    Used Car Estimator Program [UCEP]
    Enter the current Year: 2010
    Vehicle Make:
    1 for Porsche,
    2 for Chevrolet,
    3 for Volkswagon,
    4 for BMW,
    5 for Audi,
    6 for Honda,
    7 for Ford,
    8 for Mercedes
    Enter choioce: 1
    Enter the vehicle Year: 2003
    Enter the vehicle's original selling price (M.S.R.P.): 70000.00
    Enter the Kilometers driven: 12000
    
    Automobile Information:
    Make: Porsche
    Year: 2003
    Odometer: 12000
    Depreciation: 7.01%
    
    Selling Price: $65090.00
    Tax: $ 8461.70
    ----------
    Total: $73551.70
    
    
    $ a.out
    Used Car Estimator Program [UCEP]
    Enter the current Year: 2010
    Vehicle Make:
    1 for Porsche,
    2 for Chevrolet,
    3 for Volkswagon,
    4 for BMW,
    5 for Audi,
    6 for Honda,
    7 for Ford,
    8 for Mercedes
    Enter choice: 3
    Enter the vehicle Year: 2001
    Enter the vehicle's original selling price (M.S.R.P.): 31500.00
    Enter the Kilometers driven: 65267
    
    Automobile Information:
    Make: Volkswagon
    Year: 2001
    Odometer: 65267
    Depreciation: 65.15%
    
    Selling Price: $10978.64
    Tax: $ 1427.22
    ----------
    Total: $12405.86
    will work just like in the examples given.. but i can't get the classic part done. that is my problem :|

  6. #6
    and the hat of int overfl Salem's Avatar
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    I can't see why adding some
    if ( make == 1 && year == 2 )
    kind of logic would be difficult for you at this stage.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  7. #7
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    It's not, sorry i forgot to mention that this my warped version of the code I've been tryign to figure out for last 4-5 hrs @_@

    this is a better code, below:

    Code:
    int main () {
    	int cur_year, year_man, year_used, make_car, odo;
    	char make_carname[15];
    	double msrp, depreciation, dpy, dpk, depreciation_p, sell_price, gst, pst, tax, total;
    	
    	printf("Used Car Estimator Program [UCEP]\nEnter the current Year: ");
    	scanf("%d", &cur_year);
    	printf("Vehicle Make:\n1 for Porsche,\n2 for Chevrolet,\n3 for Volkswagon,\n4 for BMW,\n5 for Audi,\n6 for Honda,\n7 for Ford,\n8 for Mercedes\nEnter choice: ");
    	scanf("%d", &make_car);
    	printf("Enter the vehicle Year: ");
    	scanf("%d", &year_man);
    	printf("Enter the vehicle's original selling price (M.S.R.P.): ");
    	scanf("%lf", &msrp);
    
    	if (make_car == 1) {
    		strcpy(make_carname, "Porsche");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
    		dpy = 650.00, dpk = 0.03;
    		year_used = cur_year - year_man;	
    		depreciation = (year_used * dpy) + (odo * dpk);
    		sell_price = msrp - depreciation;
    	}
    	else if (make_car == 1 && year_man == 1948 || 1963 || 1965) {
    		strcpy(make_carname, "Porsche");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
    		dpy = 650.00, dpk = 0.03;
    		year_used = cur_year - year_man;	
    		depreciation = odo * dpk;
    		sell_price = msrp - depreciation;
    		sell_price = sell_price + 10000;
    	}
    	else if (make_car == 2) {
    		strcpy(make_carname, "Chevrolet");
    		printf("Enter the Miles driven: ");
    		scanf("%d", &odo);
    		dpy = 1950.00, dpk = 0.11 / 0.62;
    		year_used = cur_year - year_man;	
    		depreciation = (year_used * dpy) + (odo * dpk);
    		sell_price = msrp - depreciation;
    	}
    	else if (make_car == 2 && year_man == 1955 || 1957) {
    		strcpy(make_carname, "Chevrolet");
    		printf("Enter the Miles driven: ");
    		scanf("%d", &odo);
    		dpy = 1950.00, dpk = 0.11 / 0.62;
    		year_used = cur_year - year_man;	
    		depreciation = odo * dpk;
    		sell_price = msrp - depreciation;
    		sell_price = sell_price + 10000;
    	}
    	else if (make_car == 3) {
    		strcpy(make_carname, "Volkswagon");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
    		dpy = 1700.00, dpk = 0.08;
    		year_used = cur_year - year_man;	
    		depreciation = (year_used * dpy) + (odo * dpk);
    		sell_price = msrp - depreciation;
    	}
    	else if (make_car == 4) {
    		strcpy(make_carname, "BMW");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
    		dpy = 950.00, dpk = 0.05;
    		year_used = cur_year - year_man;	
    		depreciation = (year_used * dpy) + (odo * dpk);
    		sell_price = msrp - depreciation;
    	}
    	else if (make_car == 4 && year_man == 1955) {
    		strcpy(make_carname, "BMW");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
    		dpy = 950.00, dpk = 0.05;
    		year_used = cur_year - year_man;	
    		depreciation = odo * dpk;
    		sell_price = msrp - depreciation;
    		sell_price = sell_price + 10000;
    	}
    	else if (make_car == 5) {
    		strcpy(make_carname, "Audi");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
    		dpy = 1200.00, dpk = 0.06;
    		year_used = cur_year - year_man;	
    		depreciation = (year_used * dpy) + (odo * dpk);
    		sell_price = msrp - depreciation;
    	}
    	else if (make_car == 6) {
    		strcpy(make_carname, "Honda");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
    		dpy = 1350.00, dpk = 0.07;
    		year_used = cur_year - year_man;	
    		depreciation = (year_used * dpy) + (odo * dpk);
    		sell_price = msrp - depreciation;
    	}
    	else if (make_car == 7) {
    		strcpy(make_carname, "Ford");
    		printf("Enter the Miles driven: ");
    		scanf("%d", &odo);
    		dpy = 2100.00, dpk = 0.09 / 0.62;
    		year_used = cur_year - year_man;	
    		depreciation = (year_used * dpy) + (odo * dpk);
    		sell_price = msrp - depreciation;
    	}
    	else if (make_car == 7 && year_man == 1931 || 1957 || 1964 || 1965) {
    		strcpy(make_carname, "Ford");
    		printf("Enter the Miles driven: ");
    		scanf("%d", &odo);
    		dpy = 2100.00, dpk = 0.09 / 0.62;
    		year_used = cur_year - year_man;	
    		depreciation = odo * dpk;
    		sell_price = msrp - depreciation;
    		sell_price = sell_price + 10000;
    	}
    	else if (make_car == 8) {
    		strcpy(make_carname, "Mercedes");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
    		dpy = 875.00, dpk = 0.05;
    		year_used = cur_year - year_man;	
    		depreciation = (year_used * dpy) + (odo * dpk);
    		sell_price = msrp - depreciation;
    	}
    
    		depreciation_p = depreciation / msrp * 100;
    		gst = sell_price / 100 * 5;
    		pst = sell_price / 100 * 8;
    		tax = gst + pst;
    		total = sell_price + tax;
    
    		if (make_car >= 1, make_car <= 8 && total >= 0.00) {
    			printf("\nAutomobile Information:\nMake:		%s\nYear:		%d\n", 
    				make_carname, year_man);
    			printf("Odometer:  	%d\n", odo);
    			printf("Depreciation:  	%.2lf%%\n", depreciation_p);
    			printf("\nPrice:          $%.2lf\n", sell_price);
    			printf("Tax:            $%.2f\n", tax);
    			printf("                ---------\n");
    			printf("Total:          $%.2lf\n", total);
    		}
    		else if (make_car == 1 && year_man == 1948 || 1963 || 1965) {
    			printf("\nAutomobile Information:\nMake:		%s\nYear:		%d\n", 
    				make_carname, year_man);
    			printf("Odometer:  	%d\n", odo);
    			printf("Depreciation:  	%.2lf%%\n", depreciation_p);
    			printf("\nPrice:          $%.2lf\n", sell_price);
    			printf("Tax:            $%.2f\n", tax);
    			printf("                ---------\n");
    			printf("Total:          $%.2lf\n", total);
    			printf("\nThis car is a CLASSIC!\n");
    		}
    		else if (make_car == 2 && year_man == 1955 || 1957) {
    			printf("\nAutomobile Information:\nMake:		%s\nYear:		%d\n", 
    				make_carname, year_man);
    			printf("Odometer:  	%d\n", odo);
    			printf("Depreciation:  	%.2lf%%\n", depreciation_p);
    			printf("\nPrice:          $%.2lf\n", sell_price);
    			printf("Tax:            $%.2f\n", tax);
    			printf("                ---------\n");
    			printf("Total:          $%.2lf\n", total);
    			printf("\nThis car is a CLASSIC!\n");
    		}
    		else if (make_car == 4 && year_man == 1955) {
    			printf("\nAutomobile Information:\nMake:		%s\nYear:		%d\n", 
    				make_carname, year_man);
    			printf("Odometer:  	%d\n", odo);
    			printf("Depreciation:  	%.2lf%%\n", depreciation_p);
    			printf("\nPrice:          $%.2lf\n", sell_price);
    			printf("Tax:            $%.2f\n", tax);
    			printf("                ---------\n");
    			printf("Total:          $%.2lf\n", total);
    			printf("\nThis car is a CLASSIC!\n");
    		}
    		else if (make_car == 7 && year_man == 1931 || 1957 || 1964 || 1965) {
    			printf("\nAutomobile Information:\nMake:		%s\nYear:		%d\n", 
    				make_carname, year_man);
    			printf("Odometer:  	%d\n", odo);
    			printf("Depreciation:  	%.2lf%%\n", depreciation_p);
    			printf("\nPrice:          $%.2lf\n", sell_price);
    			printf("Tax:            $%.2f\n", tax);
    			printf("                ---------\n");
    			printf("Total:          $%.2lf\n", total);
    			printf("\nThis car is a CLASSIC!\n");
    		}
    		else {
    			printf("\nI wouldn't buy this car if I were you!!!\n");
    		}		
    		printf("\n\nDEBUG MODE:\n\n year_used: %d\n make_car: %d\n make_carname: %s\n year_man: %d\n odo: %d\n depreciation: %.2lf\n depreciation_p: %.2lf%%\n sell_price: $%.2lf\n tax: $%.2lf\n total: $%.2lf\n", 
    			year_used, make_car, make_carname, year_man, odo, depreciation, depreciation_p, sell_price, tax, total);
    		getchar ();
    	return 0;
    }
    All that does is:

    1) able to calculate the stuff for make_car 1-8 without taking classic car logic into the equation
    2) able to print to user if it's classic car.

    i'm working on trying to figure out what the equation for classic car config is :S

    thanks for the help!

  8. #8
    Registered User
    Join Date
    Feb 2010
    Location
    Toronto
    Posts
    6
    i rewrote the program over 10 times so far heh.
    maybe it's cos' i've been trying to figure it out for so long that my head's not working haha.. so i guess ill get to it in the morning again!

    any help in the right direction is appreciated~~!!

  9. #9
    Registered User
    Join Date
    Sep 2006
    Posts
    8,868
    Instead of two else if() statements for every make of car that could be a classic, I would use just one:


    This is your current code for BMW:
    Code:
    	else if (make_car == 4) {
    		strcpy(make_carname, "BMW");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
    		dpy = 950.00, dpk = 0.05;
    		year_used = cur_year - year_man;	
    		depreciation = (year_used * dpy) + (odo * dpk);
    		sell_price = msrp - depreciation;
    	}
    	else if (make_car == 4 && year_man == 1955) {
    		strcpy(make_carname, "BMW");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
    		dpy = 950.00, dpk = 0.05;
    		year_used = cur_year - year_man;	
    		depreciation = odo * dpk;
    		sell_price = msrp - depreciation;
    		sell_price = sell_price + 10000;
    	}
    
    // and I would put the logic into a more unified format: 
    
    	else if (make_car == 4) {
    		strcpy(make_carname, "BMW");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
                    if(year_make = 1955)  {
                       classic = 1;     //a flag. classic = 0 means no classic, = 1 means it is
                       put your code to handle classic cars in here.
    
             		dpy = 950.00, dpk = 0.05;
            		year_used = cur_year - year_man;	
    	        	depreciation = odo * dpk;
    		        sell_price = msrp + 10000;
    
                    }
                     else {   //code for non classic models in here
    
        	        	dpy = 950.00, dpk = 0.05;
              		year_used = cur_year - year_man;	
    		        depreciation = (year_used * dpy) + (odo * dpk);
                            sell_price = msrp - depreciation;
                    }
    
    /*  and remove all this. Even for a student, a calculation shouldn't have to be
         done twice, as is the case here. Because all the BMW's entered will be 
         calculated in the above example, and then all the classic BMW's will be 
         calculated all over, in this block of code. :(
    */
    	else if (make_car == 4 && year_man == 1955) {
    		strcpy(make_carname, "BMW");
    		printf("Enter the Kilometers driven: ");
    		scanf("%d", &odo);
    	}
    Arrange it to your advantage, and use the classic car flag, when you can, to reduce code redundancy and improve clarity.

    If you work out the process, on paper first, I don't believe you'll have a lot of trouble. Sometimes just sitting down and entering code is the worst way to start a program - especially for a beginner.

  10. #10
    Registered User
    Join Date
    Feb 2010
    Location
    Toronto
    Posts
    6
    True, i did think all those calculations were redundant, but just didn't know how to trim it down haha.

    thanks for the help! i can see the light at the end of the tunnel again

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