题解 - 苏州市吴江区中学生信息编程竞赛域

5
12337陈子函 (12337陈子函) LV 8 @ 2021-11-06 19:07:28

#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
double R;
cin>>R;
cout<<fixed<<setprecision(6)<<3.141592653589793*R*R<<endl;
cout<<fixed<<setprecision(6)<<2*R*R<<endl;
return 0;
}
0
ta18姚懿恒 (ta18姚懿恒) LV 7 @ 2021-12-04 20:42:01

#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
double r;
cin>>r;
cout<<fixed<<setprecision(6)<<3.141592653589793*r*r<<endl;
cout<<fixed<<setprecision(6)<<2*r*r<<endl;
return 0;
}//dtdujghtughtreuoghrejoigewjofdgrgrtgyr
0
12203沈宇阳 (12203沈宇阳) LV 8 @ 2021-11-27 17:08:34

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
double R;
cin>>R;
cout<<fixed<<setprecision(6)<<3.141592653589793*R*R<<endl;
cout<<fixed<<setprecision(6)<<2*R*R<<endl;
return 0;
}
-5
12234洪子昊 (12234洪子昊) LV 8 @ 2021-11-08 20:49:30

#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
int main()
{
double R;
cin>>R;
cout<<fixed<<setprecision(6)<<3.141592653589793*R*R*1.0<<endl;
cout<<fixed<<setprecision(6)<<2*R*R*1.0;
return 0;
}
3个头文件必不可少
122