programs off the tech school's hard drive

This is a discussion on programs off the tech school's hard drive within the C++ Programming forums, part of the General Programming Boards category; I'm on the school's network hard drive, looking around, out of curiousity for what they use in their C++ class. ...

  1. #1
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    programs off the tech school's hard drive

    I'm on the school's network hard drive, looking around, out of curiousity for what they use in their C++ class. Visual Basic.NET isn't a challenge for me, so it's discouraging and that is why I'm currently getting bad marks until I make some stuff up/settle down.

    Anyhow, I'm going to post a few programs here from the drive, and I want anybody who can find errors, etc. with the programs to post them. I can see a few, but this is more or less a thought of, I'd take the course, as it would be fun for me since I do c & c++ during my free time, but, I think this particular course is a bit dodgy.

    loop example:
    Code:
    #include <iostream.h>
    void main(void)
    // This program calculates the average
    // of five user-entered numbers.
    {
      int count;
      float num, total, average;
    
      total = 0.0;
    
      for (count = 0; count < 5; count++)
      {
        cout << "Enter a number: ";
        cin >> num;
        total = total + num;
      }
    
      average = total / count;
      cout << "\nThe average of the data entered is " << average;
    }
    array example:
    Code:
    /*		Using an array to BUILD PRICE */
    
    /* Include Files */
    #include <iostream.h>
    
    void main()
    {
    const int ARRAY_NUM	= 2;
    int price[ARRAY_NUM] = {0};
    float quantity[ARRAY_NUM];
    float amount[ARRAY_NUM];
    int incr;
    
    //magic formulas for printing decimal points
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(2);
    
    
    // Display directions
    cout << "*********************************************************************";
    cout << "\n                    The Great Widget Company";
    cout << "\n*******************************************************************";
    cout << "\nThis program will ask you for prices and quantity of Widgets";
    cout << "\nThen the program will display a table showing quantity, Price,";
    cout << "and the amount of your purchases";
    cout << "\n*******************************************************************\n\n";
    
    /* Building array */
    	for (incr = 0; incr < ARRAY_NUM; ++incr)
    	{
    		cout << "Enter a price:  ";
    		cin >> price[incr];
    		if (price[incr] == 9999)
    				break;
    		else
    		{
    		cout << "\nEnter the quantity purchased:  \n";
    		cin >> quantity[incr];
    		amount[incr] = quantity[incr];
    		}
    	}
    
    // Printing the table headings
    cout << "\n-----------------------------------------------------------------------";
    cout << "\n                       Purchasing Report";
    cout << "\n  Quantity                   Price             Amount";
    cout << "\n  --------                   -----             ------\n";
     
    // Print the array
    	for (incr = 0; incr < ARRAY_NUM; ++incr)
    	{
    		
    		cout <<  "      " << quantity[incr] << "                    " << price[incr];
    		cout << "               " << amount[incr] << "\n";
    	}
    cout << "\n\n Thank you for Using Great Widgets\n";
    }
    function example:
    Code:
    /*		This program has two functions: Main and total_cost */
    
    #include <iostream.h>
    
    //function prototype 
    void total_cost(int, double);
    
    //Global variable
    double subtotal;
    
    void main( void )
    {
    	double price;
    	int number;
    
    
    	cout << "Enter the number of items purchased: ";
    	cin >> number;
    	cout << "Enter the price per item $";
    	cin >> price;
    
    	// function call
    	total_cost(number, price);
    	
    	//magic formulas for printing decimal points
    	cout.setf(ios::fixed);
    	cout.setf(ios::showpoint);
    	cout.precision(2);
    	cout << number << " item at "
    		 << "$" << price << " each.\n"
    		 << "Final bill, including tax, is $" << subtotal
    		 << endl;
    }
    //function heading
    void total_cost(int number_par, double price_par)
    {
    	const double TAX_RATE = 0.05; //5% SALES TAX
    	
    	subtotal = price_par * number_par;
    	subtotal = subtotal + (subtotal * TAX_RATE);
    }
    The world is waiting. I must leave you now.

  2. #2
    Seeking motivation... endo's Avatar
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    int main( )
    Couldn't think of anything interesting, cool or funny - sorry.

  3. #3
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    > #include <iostream.h>
    #include <iostream>
    using namepsace std;
    The world is waiting. I must leave you now.

  4. #4
    End Of Line Hammer's Avatar
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    Originally posted by Shadow
    > #include <iostream.h>
    #include <iostream>
    using namepsace std;
    http://www.cpp-home.com/faq/faq.pl?20
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  5. #5
    Seeking motivation... endo's Avatar
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    I use this method:
    Code:
     
    #include <iostream>
    
    using std::cout;
    using std::endl;
    
    int main( )
    {
       cout << "Hello World!" << endl;
       return 0;
    }
    It doesn't make much difference in small program, but its handy for larger programs where you will be typing std::cout hundreds of times. For objects not used so much I just put std in front of it, eg.
    Code:
    std::vector<int> inVector;
    One other thing, I put argument identifers in function prototypes. It makes it easier to understand what the function does and why it need those arguments in my opinion
    Last edited by endo; 11-04-2002 at 08:38 AM.
    Couldn't think of anything interesting, cool or funny - sorry.

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