Question

C++程序失败，无法解析的外部符号

#include<iostream>
double h_mean(double x, double y);
int main()
{
using namespace std;
double x1,y1;
cout << "Enter two numbers (0 to quit): ";
while (cin >> x1 >> y 1&& x 1* y1!=0)
cout << "Harmonic mean of " <<x1 <<"end"<<y1
<< "="<< h_mean(x1,y1) << endl;
return 0;
}
double h_mema(double x, double y)
{
return 2.0 * x * y / (x + y);
}

1>12.obj : error LNK2019: 无法解析的外部符号 "double __cdecl h_mean(double,d
请问哪里出问题了
请问为什么
using namespace std;

设为全局就行呢？

Answer 1

我给你修旦岩改了一下，这样编译就通过了！

#include<iostream>
using namespace std;
double h_mema(double x, double y);
int main()
{
double x1,y1;
cout << "Enter two numbers (0 to quit): ";
while (cin >> x1 >> y1&& x1*y1!=0)
cout << "Harmonic mean of " <<x1 <<" end "宽迟启<<y1<< "="<< h_mema(x1,y1) <慎如< endl;
return 0;
}
double h_mema(double x, double y)
{
return 2.0 * x * y / (x + y);
}

Answer 2

double h_mema(double x, double y)写错了, 是h_mean

Answer 3

using namespace std;这句应该放在mian()函数的外面

Answer 4

mean
mema