Thread: Function prototype questions

Here's some hypothetical pseudocode. I'm trying to understand the relationship between function prototypes and main:

Code:

function main{
int x
int y
 } // end function main

function prototype A
int a

function prototype B
int b

1. Can function prototype A call int x? Or does int x need to be defined in A?

2. Can function B use int a?

3. Is it possible to call prototype A, return int a to main, and call int a inside prototype B?