using namespace std;
class CStudent {
public:
int nAge;
};
//插入运算符的重载
ostream& operator<<(ostream& o,const CStudent& s){
o<<s.nAge;
return o;
}
int main(int argc, const char * argv[]) {
CStudent s;
s.nAge = 5;
cout<<s<<"hello";
return 0;
}
- 需求，有实部虚部的 Complex 类输入 a+bi，将 a 给实部，b 给虚部，输出 Complex 以 a+bi 的形式输出：
#include <iostream>
#include <string>
#include <cstdlib>
class Complex {
double real,imag;
public:
Complex(double r= 0,double i = 0):real(r),imag(i){};
friend ostream & operator<<(ostream& os, const Complex& c);
friend istream & operator>>(istream& os, Complex& c);
};
ostream& operator <<(ostream& os, const Complex& c){
os<<c.real<<"+"<<c.imag<<"i";
return os;
}
istream& operator >>(istream& is, Complex& c){
//1.先将 a+bi 作为字符串读入
string s;
is>>s;
//2.处理 a+bi 字符串
int pos = s.find("+",0);
string sTmp = s.substr(0,pos);
//atof 库函数能将 const char* 指针指向的内容转换成 float
c.real = atof(sTmp.c_str());
sTmp = s.substr(pos+1,s.length()-pos-2);
c.imag = atof(sTmp.c_str());
return is;
}
int main(int argc, const char * argv[]) {
Complex c;
cin>>c;
cout<<c;
return 0;
}
