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实现一个RMB的强货币类型
#ifndef RMB_H_ #define RMB_H_ typedef double Yuan; typedef unsigned long Cent; class RMB { public: RMB(); RMB(Cent cent); RMB(Yuan yuan); RMB(RMB& that); ~RMB(); const char* toString(); Yuan GetYuan()const; Cent GetCent()const; RMB& operator=(RMB& that); RMB& operator=(Cent cent); RMB& operator=(Yuan yuan); bool operator==(RMB& that)const; bool operator> (RMB& that)const; bool operator< (RMB& that)const; bool operator>=(RMB& that)const; bool operator<=(RMB& that)const; bool operator!=(RMB& that)const; RMB& operator++(); RMB operator++(int); RMB& operator--(); RMB operator--(int); RMB& operator+=(RMB& that); RMB& operator-=(RMB& that); private: Cent m_Base; }; #endif /* RMB_H_ */
实现
#include "RMB.h" #include <stdio.h> //for sprintf RMB::RMB() :m_Base(0) { } RMB::RMB(Cent cent) { m_Base = cent; } RMB::RMB(Yuan yuan) { m_Base = yuan*100; } RMB::RMB(RMB& that) { this->m_Base = that.m_Base; } RMB::~RMB() { } Yuan RMB::GetYuan()const { return m_Base*0.01; } Cent RMB::GetCent()const { return m_Base; } const char* RMB::toString() { static char str[256]={0}; sprintf(str,"%f yuan(Cent:%lu)\n",m_Base*0.01,m_Base); return str; } RMB& RMB::operator=(RMB& that) { if(this != &that) { this->m_Base = that.m_Base; } return *this; } RMB& RMB::operator=(Cent cent) { this->m_Base = cent; return *this; } RMB& RMB::operator=(Yuan yuan) { this->m_Base = yuan*100; return *this; } bool RMB::operator==(RMB& that)const { return this->m_Base == that.m_Base; } bool RMB::operator> (RMB& that)const { return this->m_Base > that.m_Base; } bool RMB::operator< (RMB& that)const { return this->m_Base < that.m_Base; } bool RMB::operator>=(RMB& that)const { return *this > that || * this == that; } bool RMB::operator<=(RMB& that)const { return *this < that || * this == that; } bool RMB::operator!=(RMB& that)const { return ! (*this==that); } RMB& RMB::operator++() { ++this->m_Base; return *this; } RMB RMB::operator++(int) { RMB tmp(*this); ++(*this); return tmp; } RMB& RMB::operator--() { --this->m_Base; return *this; } RMB RMB::operator--(int) { RMB tmp(*this); --(*this); return tmp; } RMB& RMB::operator+=(RMB& that) { this->m_Base+=that.m_Base; return *this; } RMB& RMB::operator-=(RMB& that) { this->m_Base-=that.m_Base; return *this; }
测试代码
#include <iostream> #include "RMB.h" using namespace std; int main() { RMB m; cout<< m.toString() <<endl; ++m; RMB m1(m);//拷贝构造 cout<< m1.toString() <<endl; RMB m2 = m1;//拷贝构造 cout<< m2.toString() <<endl; //RMB n(10);无法编译通过 必须指定类型 RMB n( static_cast<Yuan>(10) ); cout<< n.toString() <<endl; RMB n1( static_cast<Cent>(10) ); cout<< n1.toString() <<endl; n1=n;//拷贝赋值 cout<< n1.toString() <<endl; if(m==n) cout << "m==n" <<endl; if(m!=n) cout << "m!=n" <<endl; if(m>n) cout << "m>n" <<endl; if(m<n) cout << "m<n" <<endl; if(m>=n) cout << "m>=n" <<endl; if(m<=n) cout << "m<=n" <<endl; //m = 200;无法编译通过 必须指定类型 m = static_cast<Yuan>(200); cout<< m.toString() <<endl; n = static_cast<Cent>(200); cout<< n.toString() <<endl; return 0; }
运行结果
0.000000 yuan(Cent:0)
0.010000 yuan(Cent:1)
0.010000 yuan(Cent:1)
10.000000 yuan(Cent:1000)
0.100000 yuan(Cent:10)
10.000000 yuan(Cent:1000)
m!=n
m<n
m<=n
200.000000 yuan(Cent:20000)
2.000000 yuan(Cent:200)
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