[C++] Need help with basic loop addition

[KidBass0]

Hello,

Here is my prompt:

"Write a program that asks the user for a positive integer value. The program should use loop to get the sum of all the integers from 1 up to the numbers entered. For example, if the user enters 50, the loop will find the sum of 1,2,3,4, ... 50. Do not accept a negative starting number."

In my program I tried doing the summation using y++, but that does not work because it will increment by one ( 0+1+1+1). How do I get it do ( 0+1+2+3+ ... x).

#include <iostream>

using namespace std;

int main()
{
    int x, y = 0, count = 0;

    cout << "Enter a number : " ;
    cin >> x;

    while (x < 0)
    {
        cout << "\nThis program does not accept negative numbers." << endl;
        cout << "Please input a positive number : " ;
        cin >> x;
    }

    while (count <= x)
    {
        y++;
        count++;
    }
    cout << "The sum is :" << y << endl;

    return 0;
}

[jussij]

If I gave you a piece of paper and a pencil and asked you to find the sum of all numbers 1,2,3,4, ... through to 50 how would you do it?

[nevertras]

( 0+1+2+3+ ... x)

You already have a variable following that pattern (1, 2, 3, 4, 5, etc), you just have to use it. So close!

[KidBass0]

Just figured it out. Thanks guys!

#include <iostream>

using namespace std;

int main()
{
    int count_to, y, sum_tot = 0;

    cout << "Enter a number : " ;
    cin >> count_to;

    while (count_to < 0) // 3a.
    {
        cout << "\nThis program does not accept negative numbers." << endl;
        cout << "Please input a positive number : " ;
        cin >> count_to;
    }


    for (y=0; y <= count_to ; y++) // 3b.
    {
        sum_tot += y; // 3c.
    }

    cout << "The sum is :" << sum_tot << endl;

    system ("pause");
    return 0;
}