[求助]同一程序 换个地方 就出现出现错误 望帮忙！
#include<iostream.h>using namespace std;
int main(){
double radius;
cout<<"please iuput radius:<<\n;
cin>>radius;
cout<<"the result is:"<<result<<\n;
double result=radius*radius*3.14*4;
}
using namespace std;
int main(){
double radius;
cout<<"please iuput radius:<<\n;
cin>>radius;
cout<<"the result is:"<<result<<\n;
double result=radius*radius*3.14*4;
}
