c++ - 错误: Qualified reference to 'Complex' is a constructor name rather than a type in this context

Question

我刚开始学习C++，我不明白为什么当我在类外定义Complex类的构造函数时，会出现编译错误，请帮忙!

using namespace std;

int main(int argc, const char * argv[]) {
    
    class Complex{
    private:
        double real;
        double imag;
    public:
        Complex (double r, double i);
    };
    
    Complex::Complex(double r, double i){
        real = r;
        imag = i;
    };
    

    return 0;
};

Answer 1

您应该将 Complex 类的定义移至 外部 main() 函数，如下所示:

#include <iostream>
class Complex{
    private:
        double real;
        double imag;
    public:
        Complex (double r, double i);
    };
    
    Complex::Complex(double r, double i){
        real = r;
        imag = i;
    };


int main(int argc, const char * argv[]) {

    return 0;
}; //unnecessary semicolon. You should remove this semicolon too