Use a function's definition as its prototype, appears before main : function prototype « Function « C++ Tutorial






  1. C++ Tutorial
  2. Function
  3. function prototype
#include <iostream> 
using namespace std; 
  
bool isEven(int num) {  
  if(!(num )) 
      return true; 
  return false;  
}  
  
int main()  
{  
  if(isEven(4)) 
      cout << "4 is even\n";  
  if(isEven(3)) 
      cout << "this won't display";  
  
  return 0;  
}

4 is even




7.2.function prototype
7.2.1.Use a function prototype to enforce strong type checking
7.2.2.Use a function's definition as its prototype, appears before main
7.2.3.Returning a pointer from function