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#2
rjsp2018-12-17 09:48
建议你换本教科书
 程序代码：#include <iostream> class Complex { public: Complex( int a=0, int b=0 ) : a_(a), b_(b) { } private: int a_; int b_; friend Complex operator+( const Complex& lhs, const Complex& rhs ); friend std::ostream& operator<<( std::ostream& os, const Complex& cpl ); }; Complex operator+( const Complex& lhs, const Complex& rhs ) { return Complex( lhs.a_+rhs.a_, lhs.b_+rhs.b_ ); } std::ostream& operator<<( std::ostream& os, const Complex& cpl ) { return os << '(' << cpl.a_ << '+' << cpl.b_ << "i)"; } using namespace std; int main(void) { Complex c1(10,20 ); Complex c2(1, 2); cout << c1 << '\n' << c2 << '\n'; Complex c4 = c2 + c1 + c1; cout << c4 << endl; } |
最近在学习C++,在重载操作符遇到困难，重载“+”操作符后，
只能进行a+b, 无法进行a+b+c这样的操作，这是什么原因？
求各位大神，告诉小弟如何解决。
以下是代码：
#include <iostream>
using namespace std;
class Complex
{
public:
Complex()
{
this->a = 0;
this->b = 0;
}
Complex(int a, int b)
{
this->a = a;
this->b = b;
}
//提供一个打印虚数的方法
void print()
{
cout << "(" << a << "+ " << b << " i )" << endl;
}
friend Complex operator+(Complex &c1, Complex &c2);
private:
int a;
int b;
};
Complex operator+(Complex &c1, Complex &c2)
{
Complex temp(c1.a + c2.a, c1.b + c2.b);
return temp;
}
int main(void)
{
Complex c1(10, 20);
Complex c2(1, 2);
c1.print();
c2.print();
// Complex c4 = c1 + c2 ; //可以运行
// c4.print();
Complex c4 = c2 + c1 + c1; //错误，为什么？
c4.print();
return 0;
}