謝瀞儀

1. #include<iostream>
   
2. #include<cstdlib>
   
3. using namespace std;
   
4. const double PI=3.1415926535897932384626433832795028841971693993751058209749445648566923460348610454326648213393607260249141273;
   
5. int main()
   
6. {
   
7.     double r;
   
8.     cout<<"r=";
   
9.     cin>>r;
   
10.     cout<<"r"<<r<<"cm's circle,面積="<<r*r*PI<<"cm2"<<endl;   
    
11.     system ("pause");
    
12.     return 0;
    
13. }

複製代碼