C++内联函数

#include<iostream>

inline double square(double x){return x*x;}

int main()
{
using namespace std;
double a,b;
double c = 13.0;

a = square(5.0);
b = square(4.5 + 7.5);
cout <<"a="<<a<<",b="<<b<<"\n";
cout <<"c="<<c;
cout <<",c squared = "<<square(c++)<<"\n";
cout << "Now c="<< c << "\n";
return 0;
}