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#incloude <instream>
#incloude <math.h>
using namespace std;
double area(double)
const double PI=3.1415926;
double area(double);
void main(); 
(
    double r(0),s=0;
    cout<<"请输入半径："; 
    cin>>r;
    s=area(r);
    cunt<<"圆的面积："<<s<<endl;
)
double area (double r)
(
return PI*pow(r,2);
) 
 

prog.cpp:1:2: error: invalid preprocessing directive #incloude
 #incloude <instream>
  ^
prog.cpp:2:2: error: invalid preprocessing directive #incloude
 #incloude <math.h>
  ^
prog.cpp:5:7: error: expected initializer before 'double'
 const double PI=3.1415926;
       ^
prog.cpp:7:11: error: '::main' must return 'int'
 void main(); 
           ^
prog.cpp:9:5: error: expected unqualified-id before 'double'
     double r(0),s=0;
     ^
prog.cpp:9:5: error: expected ')' before 'double'
prog.cpp:10:5: error: 'cout' does not name a type
     cout<<"请输入半径："; 
     ^
prog.cpp:11:5: error: 'cin' does not name a type
     cin>>r;
     ^
prog.cpp:12:5: error: 's' does not name a type
     s=area(r);
     ^
prog.cpp:13:5: error: 'cunt' does not name a type
     cunt<<"圆的面积："<<s<<endl;
     ^
prog.cpp:14:1: error: expected unqualified-id before ')' token
 )
 ^
prog.cpp:18:1: error: expected unqualified-id before ')' token
 ) 
 ^

Standard output is empty