/*
 *  ARRAYLIB_H
 *
 *  The #ifndef, #define and #endif are pre-processor commands to test whether
 *  a symbol ARRAYLIB_H has been defined and if so - skip the whole block
 *  else compile it.  After the first time this file is compiled, the symbol
 *  ARRAYLIB_H gets defined and the file will never get compiled again.
 *  
 *  This prevents redundant compilation which results in possible redefinition
 *  of functions and resulting compilation errors.
 *
 *  The #ifndef mechanism relieves the programmer from having to worry about
 *  whether a file that has been #include'd in multiple places is compiled only
 *  once.
*/


#ifndef ARRAYLIB_H
    #define ARRAYLIB_H

void swapInts(int *a, int *b);
void copyArray(int a[], int aLen, int b[], int bLen);
void swapArrays(int a[], int aLen, int b[], int bLen);
void printArray(int arr[], int arrLen);

#endif