Program to calculate sum of square series using while loop in C.

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/*program to calculate sum of the series 
(1*1)+(2*2)+(3*3)+(4*4)+.......+(n*n).
Square number series. 
where n is the limit entered by user.
*/

#include<stdio.h>
#include<conio.h>
void main()
{
int i,sum,num;

clrscr();

sum=0;

printf("\nEnter limit : ");
scanf("%d",&num);

printf("\nSquare Number Series ");

printf("\nSeries= ");

i=1;                   //initialization 

while(i<=num)
{
sum=sum+(i*i);
printf("+ (%d*%d)",i,i);

i++;       // increment post fix operator 

}

printf("\n\nSum of series= %d",sum);

getch();
}