sum & avg while

#include<stdio.h>
int main()
{
    double avg,x,y,sum=0,i;

    while(1)
    {
        printf("enter range: ");
        scanf("%lf %lf",&x,&y);
        for(i=x; i<=y; i++)
        {
            sum=sum+i;
        }
        avg=sum/y;
        printf("%lf\n",sum);
        printf("%lf\n",avg);
    }
    return 0;
}