第八章--函数进阶

#include <iostream>  
using namespace std;  
inline double square(double x)  
{  
    return x * x;  
};  
int main()  
{  
    cout << "HelloWorld" << endl;  
    double a, b;  
    double c = 13.0;  
    a = square(5.0);                //a=25  
    b = square(4.5 + 7.5);      //b=144  
    cout << a << " " << b << "\n";    
    cout << square(c++) << "\n";    //c=169  
    cout << c << "\n";      //c=14  
    cin.get();  
    return 0;  
}