1.find sum of even numbers between 1 to n

#include<stdio.h>
main()
{
int i=1,n,sum=0;
scanf("%d",&n);
while(i<=n)
{
 if(i%2==0)
 sum=sum+i;
 i++;
}
printf("sum of numbers 1 to n is %d",sum);
return 0;

}