Question

这C++程序为什么运行不了？错误显示：错误 1 error C3861: “getresult”: 找不到标识符

#include <iostream>
using namespace std;

int age;
int main(){
cout<<"Please enter your age!"<<endl;
cin>>age;
getresult();
system("pause");
return 0;
}

void getresult(){
if(age>30){
cout<<"You are old!"<<endl;
}
else{
cout<<"Your are young!"<<endl;
}
}

Answer 1

把getresult函数声明放到main()之前，让编译器知道有getresult()这个函数。

#include <iostream>
using namespace std;

void getresult();
int age;

int main(){
cout<<"Please enter your age!"<<endl;
cin>>age;
getresult();
system("pause");
return 0;
}

void getresult()
{
if(age>30){
cout<<"You are old!"<<endl;
}
else{
cout<<"Your are young!"<<endl;
}
}