What's wrong ?

#include <math.h>
#include <stdio.h>
#define PI 3.1415926535
int main() {
    double R,a,S,t;
    scanf("%lf%lf", &a, &R);
    t = sqrt(2.0)*a;
    if( R < (a/2.0) ) { S = PI*R*R; }
    if( R >= t/2.0 ) { S = a*a; }
    if( R < t/2.0 ) { S = PI*R*R - 4*( acos( a/(2.0*R) )*R*R - R*R*sin( 2*acos( a/(2.0*R) ) )/2.0); }
    printf("%.3lf\n", S);
    return 0;
    }

 AC. I had to "return" and "printf" in each "if"...

Edited by author 27.04.2010 23:34

Edited by author 27.04.2010 23:34

Or maybe just use if ... else ... if else?