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Coding Question 20

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The equation x2+y2=r2 represent a circle which centres at origin and radius is r. Write a program that read r from the keyboard and print the number of points with integer co-ordinate that lie on the circumference of the circle.   

#include<stdio.h>

int main()
{

int x,y,r;

printf("\n Enter the radius:");
scanf("%d",&r);

for(x=-r;x<=r;x++)
{
for(y=-r;y<=r;y++)
{
if(x*x+y*y==r*r)
{
printf("\n The co-ordinates are: %d and %d",x,y);

}

}

}

return 0;
}
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