C Program to find area of Ellipse

Program

#include<stdio.h>
#define PI 3.141
void main()
{
	int a, b;
	float area;
	printf("Enter the first semiaxes:\t");
	scanf("%d", &a);
	printf("Enter the second semiaxes:\t");
	scanf("%d", &b);
	area = PI * a * b;
	printf("Area of the ellipse is:\t%f\n", area);
}

Output

Enter the first semiaxes:	6
Enter the second semiaxes:	11
Area of the ellipse is:	207.306000