Inline functions work best on short functions that are used repeatedly. This example calculates the square of an integer. : inline function « Function « C++ Tutorial

1. C++ Tutorial
2. Function
3. inline function

#include <iostream>
using namespace std;

inline long squareit(int iValue) {return iValue * iValue;}
                               
int main()
{
 int iValue = 5;

 cout << squareit(iValue) << endl;

 return (0);
}