/*This program will print the sum of the square
of all natural numbers from 1 to N.*/
#include<stdio.h>
int main()
{
int i,N;
unsigned long 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*i);
/*print the sum*/
printf("Sum of the series is: %ld\n",sum);
return 0;
}

Enter the value of N: 100
Sum of the series is: 338350

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