林家鉌

1. #include<iostream>
   
2. #include<cstdlib>
   
3. using namespace std;
   
4. int main()
   
5. {
   
6.         float r;
   
7.         cout<<"pis input the radius of the circle";
   
8.         cin>>r;
   
9.         cout<<"if the radius of the circle is "<<r<<",then the area of the circle should be "<<r*r<<" times pai\n"<<"which is about "<<r*r*3.1415;
   
10. 
    
11.         system("pause");
    
12.         return 0;
    
13. }

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