程序代码：

# include <iostream>

int myadd(int a,int b){ return a+b; }
double myadd(double a,double b){ return a+b; }

int main ()
{
    std::cout<<myadd(4,5)<<std::endl;
    std::cout<<myadd(4.5,5.6)<<std::endl;
    return 0;

 }