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C > For Loops and While Loops Code Examples

Program to Read Input Until User Enters a Positive Integer

Program to Read Input Until User Enters a Positive Integer

The positive numbers 1, 2, 3... are known as natural numbers. The programs below takes a positive integer (let say n) as an input from the user and calculates the sum up to n.

#include <stdio.h>
int main()
{
    int n, j, sum = 0;

    do {
        printf("Enter a positive integer: ");
        scanf("%d",&n);
    }
    while (n <= 0);

    for(j=1; j <= n; ++j)
    {
        sum += j;   // sum = sum+j;
    }

    printf("Sum = %d",sum);

    return 0;
}

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