C PROGRAM TO CALCULATE SUM OF NATURAL NUMBERS

#include <stdio.h>
int main()
{
    int a, count, sum;
    sum=0;
    printf("Enter an integer value : ");
    scanf("%d",&a);
    for(count=1;count<=a;++count)
    {
        sum+=count;              
    }
    printf("Sum = %d",sum);
    return 0;
}
OUTPUT
Enter an integer value : 5
Sum = 15