ACM 10573 - Geometry Paradox

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

int r1, r2;

void setR()
{
    char ch;
    int n;
    while (ch = getchar())
    {
        if (ch == ' ') break;
        if (ch == '\n'){ r2 = -1; return; }  
        r1 = r1 * 10 + ch - '0';
    }
    while (ch = getchar())
    {
        if (ch == '\n') return;  
        r2 = r2 * 10 + ch - '0';
    }
    
}
int main()
{
    double PI = 2 * acos(0.0);
    int n;
    scanf("%d", &n);
    getchar();
    while (n --)
    {
        r1 = 0, r2 = 0;
        setR();
        
        if (r2 != -1) 
            printf("%.4f\n", (double)((r1 + r2) * (r1 + r2) - r1 * r1 - r2 * r2) * PI );
        else
            printf("%.4f\n", (PI * (double)(r1 * r1)) / 8);
    }
    return 0;
}

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