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#include "iostream.h"
int main()
{
float r;
float l;
const float sj=3.1415926F;
cout <<"半径是: ";
cin>>r ;
l=2*sj*r;
cout <<"周长是" <<l <<endl;
return 0;
}
#include <iostream> //<-------更正这里试试
int main(){
float r;
float l;
const float sj = 3.1415926F;
cout << "半径是:";
cin >> r;
l = 2 * sj * r;
cout <<"周长是" <<l <<endl;
}
#include "stdafx.h"
#include <iostream>
using namespace std;
int main()
{
float r;
float l;
const float sj=3.1415926F;
cout < <"半径是: ";
cin>>r ;
l=2*sj*r;
cout < <"周长是" < <l < <endl;
return 0;
}
'#include "iostream.h"
int main()
{
float r;
float l;
const float sj=3.1415926F;
cout<<"半径是: ";
cin>>r;//加上分号
l=2*sj*r;
cout<<"周长是"<<l<<endl;
return 0;
}