Question..Help..Real Number Object ?

Hello,

I coded this program today for an intro C++ class, works great and all that good stuff I just had a question maybe someone can help with.

The teacher says we must use real number objects that identify price,payment, and change.

My question is did I do this already or am I missing the concept, or have I missed it completely ?

Any help is appreciated, if I am asking for to much information without putting enough into my source I am sorry.

Thank you in advance...

Code:

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/*
        Program Description:This Program operates as a Cash Register.
        User enters amount of purchase, then enters amount paid toward
        purchase. Change to return to user is calculated as well as
        number of returned coins are counted. All information is formatted
        and output to user.
*/

//        system defined preprocessor statement for cin/cout operations
#include < iostream.h >

//        programmer defined preprocessor statement for setreal operation
#include "textlib.h"

//        system defined preprocessor statement for set width operation
#include <iomanip.h>

int main( )
{
        // comment constant object above the code
        const int QUARTERS = 25;
        //
        const int DIMES = 10;
        //
        const int NICKELS = 5;
        //
        const int PENNIES = 1;

        // comment object above the code
        double change;
        //
        double price;
        //
        double payment;
       
        //
        int coinChange;
        //
        int dollars;
        //
        int quarterChange;
        //
        int dimeChange;
        //
        int nickelChange;
        //
        int pennyChange;
       
        cout << "Enter the purchase total $: ";
        cin  >> price;
        cout << "Enter the payment $: ";
        cin  >> payment;

        // comment calculations
        change = payment - price;

        //
        dollars = int(change);

        //
        coinChange = (int((change-dollars)*100));

        //
        quarterChange = coinChange/QUARTERS;
        coinChange -= (quarterChange*QUARTERS);

        //
        dimeChange = coinChange/DIMES;
        coinChange -= (dimeChange*DIMES);

        //
        nickelChange = coinChange/NICKELS;
        coinChange -= (nickelChange*NICKELS);

        //
        pennyChange = coinChange/PENNIES;
       
        cout << "Purchase Total" << setw(7) << price << setreal(1,2) << endl;
        cout << "Payment" << setw(14) << payment << setreal(1,2) << endl;
        cout << "Change" << setw(15) << change << setreal(1,2) << endl;
        cout << "Dollars" << setw(14) << dollars << setreal(1,0) << endl;
        cout << "Quarters" << setw(13) << quarterChange << setreal(1,1) << endl;
        cout << "Dimes" << setw(16) << dimeChange << setreal(1,1) << endl;
        cout << "Nickels" << setw(14) << nickelChange << setreal(1,1) << endl;
        cout << "Pennies" << setw(14) << pennyChange << setreal(1,1) << endl;

        return 0;
}

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c and c++ languages do not have a "real" data type, only float and double. I guess you could typedef a real

Code:

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typedef float real;
...
real  change, price, payment;

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Heres a little bit of a revised code I added all the comments.

Code:

---

//        Benjamin Shively
/*
        Program Description:This Program operates as a Cash Register.
        User enters amount of purchase, then enters amount paid toward
        purchase. Change to return to user is calculated as well as
        number of returned coins are counted. All information is formatted
        and output to user.
*/

//        system defined preprocessor statement for cin/cout operations
#include < iostream.h >

//        programmer defined preprocessor statement for setreal operation
#include "textlib.h"

//        system defined preprocessor statement for set width operation
#include <iomanip.h>

int main( )
{
        //        quarter value
        const int QUARTERS = 25;
        //        dime value
        const int DIMES = 10;
        //        nickel value
        const int NICKELS = 5;
        //        penny value
        const int PENNIES = 1;

        //        total purchase price
        double price;
        //        total of payment towards purchase
        double payment;
        //        cash due to customer after payment
        double change;
       
        //        change part of cash due to customer
        int coinChange;

        //        dollar part of cash due to customer
        int dollars;

        //        number of quarters returned to customer
        int quarterChange;

        //        number of dimes returned to customer
        int dimeChange;

        //        number of nickels returned to customer
        int nickelChange;

        //        number of pennies returned to customer       
        int pennyChange;
       
        cout << "Enter the purchase total $: ";
        cin  >> price;
        cout << "Enter the payment $: ";
        cin  >> payment;

        //        change result ater total price is subtracted from payment
        change = payment - price;

        //        dollars returned in change due to customer       
        dollars = int(change);

        //        change returned from cash to customer
        coinChange = (int((change-dollars)*100));

        //        number of quarters returned to customer
        quarterChange = coinChange/QUARTERS;
        coinChange -= (quarterChange*QUARTERS);

        //        number of dimes returned to customer
        dimeChange = coinChange/DIMES;
        coinChange -= (dimeChange*DIMES);

        //        number of nickels returned to customer
        nickelChange = coinChange/NICKELS;
        coinChange -= (nickelChange*NICKELS);

        //number of pennies returned to customer
        pennyChange = coinChange/PENNIES;
       
        cout << "Purchase Total" << setw(7) << price << setreal(1,2) << endl;
        cout << "Payment" << setw(14) << payment << setreal(1,2) << endl;
        cout << "Change" << setw(15) << change << setreal(1,2) << endl;
        cout << "Dollars" << setw(14) << dollars << setreal(1,0) << endl;
        cout << "Quarters" << setw(13) << quarterChange << setreal(1,1) << endl;
        cout << "Dimes" << setw(16) << dimeChange << setreal(1,1) << endl;
        cout << "Nickels" << setw(14) << nickelChange << setreal(1,1) << endl;
        cout << "Pennies" << setw(14) << pennyChange << setreal(1,1) << endl;

        return 0;
}

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Quote:

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Originally Posted by Meth

Heres a little bit of a revised code I added all the comments.

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all you had to do was edit your original post :rolleyes:

If your intro to C++ class is teaching you to use <iostream.h> and <iomanip.h>, then it is behind the times. That code is non-standard and won't work on modern compilers. Hopefully your teacher can update the material to use standard C++.

As for your use of real numbes, you are using double, and a double holds a real number, so you are probably fine. My guess is that the teacher meant that you should not use int, since int only holds integers instead of any real number.

Quote:

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Originally Posted by Daved

If your intro to C++ class is teaching you to use <iostream.h> and <iomanip.h>, then it is behind the times. That code is non-standard and won't work on modern compilers. Hopefully your teacher can update the material to use standard C++.

As for your use of real numbes, you are using double, and a double holds a real number, so you are probably fine. My guess is that the teacher meant that you should not use int, since int only holds integers instead of any real number.

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Thank you,

Yes I have gathered this, this teacher just seems like she is coding on the 80s I have done a lot of coding classes and so I am not a total newbee, she hammers us hard on comments and spacing not so much on coding so lol

But that is what I was asking

Thx again my friend.