Стек - C++

#include <stdio.h>
#include <stdlib.h>
 
#define SIZE 100
int top = 0;
int stack[SIZE];
 
void push ( int val )
{
    if ( top >= SIZE )
    {
        puts ( "Can't push: size is max\n" );
        exit ( EXIT_FAILURE );
    }
    printf ( "Pushing #%u element: %d\n", top, val );
    stack[top++] = val;
}
 
int pop()
{
    if ( ( --top ) < 0 )
    {
        puts ( "Can't pop: stack is empty\n" );
        exit ( EXIT_FAILURE );
    }
    printf ( "Poping #%u element: %d\n", top, stack[top] );
    return stack[top];
}
 
 
int main ( void )
{
    size_t i;
    for ( i = 0; i < 15; ++i )
        push ( i * i + 1 );
    while ( top )
        pop();
    return EXIT_SUCCESS;
}