UVA 10573 - Geometry Paradox

/***
	Md. Nazmul Hasan
	Shahjalal University of Science & Technology,Sylhet.
	hasan08sust@gmail.com
	***/
	#include<iostream>
	#include<cstdio>
	#include<stack>
	#include<queue>
	#include<map>
	#include<vector>
	#include<algorithm>
	#include<cstring>
	#include<sstream>
	#include<cmath>
	#include <iomanip>
	using namespace std ;
	typedef long long ll ;
	typedef int in ;
	typedef unsigned long long ull ;
	const double pi = 2*acos(0) ;
	#define maxi 40000
	#define pf printf
	#define sc scanf
	#define pb push_back
	#define MEM(x,y) (memset((x),(y),sizeof(x)))
	#define MIN(x,y) ((x) < (y) ? (x) : (y))
	#define MAX(x,y) ((x) > (y) ? (x) : (y))
	#define load(array,size) for(int i=0 ; i<size ; i++) cin>>array[i] ;
	#define new_line pf("\n")
	#define clear_data(array) memset(array,0,sizeof(array))
	#define highest_int 2147483647
	int main()
	{
	int n,a,b;
	char str[1001];
	double bigCircle,small1,small2,outerArea;
	sc("%d",&n);
	getchar();
	while(n--){
	gets(str);
	a=0;
	b=0;
	//sscanf(str,"%d %d",&a,&b);
	if(sscanf(str,"%d %d",&a,&b)==2){
	outerArea = pi*2*a*b ;
	}else{
	sscanf(str,"%d",&b);
	outerArea = pi*(b*b)/8 ;
	}
	pf("%.4lf\n",outerArea);
	}
	return 0;
	}