Circle and a point

/*A program to check whether a given point lies inside the circle, on  the circle or outside the circle */

#include <stdio.h>
#include <math.h>

int main()

{
    int h,k,x,y,r;
    float a;
    printf("enter center (h,k) of a circle\n");
    scanf("%d%d",&h,&k);
    printf("\nenter radius\n");
    scanf("%d",&r);
    printf("\nenter a point to be checked\n");
    scanf("%d%d",&x,&y);
    a=sqrt(pow(x-h,2)+pow(y-k,2));
    if (a<r)
        printf("\npoint (%d, %d) lies inside the circle",x,y);
    else if (a==r)
        printf("\npoint (%d, %d) lies on the circle",x,y);
    else
        printf("\npoint (%d, %d) lies outside the circle",x,y);
    printf(" having centre (%d,%d) and radius %d\n",h,k,r);
    return 0;

}