姜俊宇 实验中学 35班
1000#include<iostream>
using namespace std;
int main()
{
int a,b;
cin>>a;
cin>>b;
int c=a+b;
cout<<c<<endl;
return 0;
} #include<iostream>
using namespace std;
int main()
{
int r;
cin>>r;
double s=r*r*3.14;
double c=r*2*3.14;
cout<<s<<endl<<c;
return 0;
}
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