sum of even numbers between 1 to n. - using while loop

#include<stdio.h>
int main()
{
    int num,i=2,sum=0;
    scanf("%d",&num);

    while(i<=num)
    {
        sum=sum+i;
        i=i+2;
    }

    printf("sum of even numbers = %d",sum);
    return 0;
}