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

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C++ Tutorial » Function » function prototype

7.2.2.Use a function's definition as its prototype, appears before main

#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

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