#include <stdio.h>
int main()
{
    int num,  i,  sum = 0;
   
    printf("Enter an integer: ");
    scanf("%d",  &num);
   
    for(i=1; i <= num; i++)
           {
                  sum = sum + i;
           }
   
    printf(" \n The result is : %d", sum);
    return 0;
}

 OUTPUT:

 Enter an integer : 5
The result is : 15
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