How to do algorithm type functions?

[Briandb1222]

Ok, how would I get my MS-DOS prompt calculator to allow the user to inter multiple integers, and then add/multiply/etc them together? I've done this before, but I do not remember how, because it was SO long ago, and I forgot most of my C++.

[mike246]

#include <iostream>

using namespace std;

int main()
{
    int total = 0;
    const int MAX = 10;
    int numArray[ MAX ];

    for( int i = 0; i < MAX; i++ )
    {
        cout << "Enter integer: ";
        cin >> numArray[ i ];
        total += numArray[ i ];
    }

    cout << "\nThe total is " << total;

    return 0;
}

Here's a simple program that computes the sum of 10 integers, the integers entered by the user a stored in an array, every time the user enters an integer into the array, that number is added to total. You could replace "total += numArray[ i ]" with "total *= numArray[ i ]" to multiply the integers.

[Briandb1222]

Ok, looks good except for one thing...copying your program directly results in the the program repeating the inquiry to enter an integer for the number of integers I enter. For example...if I did 2 integers it would return "Enter integer:" twice more but not give any results. If I enter 10 integers per MAX, it would return "Enter integer" 10 times, plus give the results.

[mike246]

You could use a sentinel controlled loop to add all the integers you enter until you type in the sentinel. For example...

#include <iostream>

using namespace std;

int main()
{
    int total = 0;
    int num;

    cout << "Enter integer: ";
    cin >> num;

    while( num != -1 )
    {
            total += num;
            cout << "Enter integer: ";
            cin >> num;
    }

    cout << "\nThe total is " << total;

    return 0;
}

This program will keep prompting you for input until you enter "-1" (the sentinel) which causes the program to break out of the loop and display the total of the integers you've entered. This way you can add any number of integers.

[LB]

A do while loop would be better for mike246's program ;)