C++ Note on Declarations

In C++ we must declare a Function/Routine before we use it UNLESS it appears in code before it is first used.



Example;


#include <iostream>
using namespace std;

int main()
{
test(); //THIS IS WRONG, WONT COMPILE
}

void test()
{
// Do Something
}





#include <iostream>
using namespace std;
void test(); //THIS IS THE FIX, DECLARE BEFORE USE

int main()
{
test(); }

void test()
{
//Do something
}





#include <iostream>
using namespace std;

void test() // THIS ALSO WORKS AS TEST APPEARS BEFORE IT IS CALLED
{
}

int main()
{
test();
}