C program to find sum of all natural numbers

/*This program will print the sum of all natural numbers from 1 to N.*/
 
#include<stdio.h>
     
int main()
{
    int i,N,sum;
     
    /*read value of N*/
    printf("Enter the value of N: ");
    scanf("%d",&N);
     
    /*set sum by 0*/
    sum=0;
     
    /*calculate sum of the series*/
    for(i=1;i<=N;i++)
        sum= sum+ i;
     
    /*print the sum*/
     
    printf("Sum of the series is: %d\n",sum);
     
    return 0;
}

    Enter the value of N: 100
    Sum of the series is: 5050