c++ 重载构造函数示例

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/*******************************************************
*author：彭晓林
*copyright: 版权所有，翻版不究】
*function: 构造函数缺省参数测试
******************************************************/

#include <iostream>
#include <string>

using namespace std;

class SUM
{
public:
  SUM();
  SUM(int a, int b);
  SUM(float a, float b);

  void print();
private:
  double Total;
};

int main()
{
SUM a;
a.print();

SUM aInt(1,2);
aInt.print();

SUM aFloat(1.2f, 1.3f);
aFloat.print();

while(1);
}
SUM::SUM()
{
Total = 0;

cout<<"无参构造函数被调用"<<endl;
cout<<"No Parameter Sum is "<<Total<<endl;;
}
SUM::SUM(int a, int b)
{
Total = a + b;

cout<<"Int构造函数被调用"<<endl;
cout<<"Int Parameter Sum is "<<Total<<endl;;
}
SUM::SUM(float a, float b)
{
Total = a + b;

cout<<"float构造函数被调用"<<endl;
cout<<"float Parameter Sum is "<<Total<<endl;;
}

void SUM::print()
{
cout<<"The Total is "<<Total<<endl;
}