ADD file via upload

YUAN(2).cpp

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+#include<iostream>
+using namespace std;
+
+int main()
+{  
+    const double pi=3.14;
+    double r,c,s;
+    cin>>r;
+    c=2.0*pi*r ;
+    s=pi*r*r;
+    cout<<c<<endl;
+    cout<<s<<endl;
+    
+
+    return 0 ;
+}

doc

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-undefined