函数重载-C++

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/*
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功能：函数重载
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日期：2013-09-23
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*/
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#include <iostream>
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using namespace std;
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int fun(int a=1,int b=2)
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{
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  int sum;
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  sum = a * a + b * b;
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  return sum;
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}
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float fun(float a,float b)
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{
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  float sum;
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  sum = a * a + b * b;
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  return sum;
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}
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double fun(double a,double b)
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{
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  double sum;
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  sum = a * a + b * b;
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  return sum;
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}
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int main(void)
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{
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  cout<<"fun():"<<fun()<<endl;
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  cout<<"fun(2.5f,3.3f):"<<fun(2.5f,3.3f)<<endl;
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  cout<<"fun(1.5,1.2):"<<fun(1.5,1.2)<<endl;
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  system("pause");
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  return 0;
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}