Array as Stack in C

A simple program how to implement the concept of array as stack using C language.

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Program Listing

array.c

#include <stdio.h>

#include <conio.h>

#define MAX 10

struct stack

{

int arr[MAX] ;

int top ;

} ;

void initstack ( struct stack * ) ;

void push ( struct stack *, int item ) ;

int pop ( struct stack * ) ;

void main( )

{

struct stack s ;

int i ;

clrscr( ) ;

initstack ( &s ) ;

push ( &s, 11 ) ;

push ( &s, 23 ) ;

push ( &s, -8 ) ;

push ( &s, 16 ) ;

push ( &s, 27 ) ;

push ( &s, 14 ) ;

push ( &s, 20 ) ;

push ( &s, 39 ) ;

push ( &s, 2 ) ;

push ( &s, 15 ) ;

push ( &s, 7 ) ;

i = pop ( &s ) ;

printf ( "\n\nItem popped: %d", i ) ;

i = pop ( &s ) ;

printf ( "\nItem popped: %d", i ) ;

i = pop ( &s ) ;

printf ( "\nItem popped: %d", i ) ;

i = pop ( &s ) ;

printf ( "\nItem popped: %d", i ) ;

i = pop ( &s ) ;

printf ( "\nItem popped: %d", i ) ;

getch( ) ;

}

/* intializes the stack */

void initstack ( struct stack *s )

{

s -> top = -1 ;

}

/* adds an element to the stack */

void push ( struct stack *s, int item )

{

if ( s -> top == MAX - 1 )

{

printf ( "\nStack is full." ) ;

return ;

}

s -> top++ ;

s -> arr[s ->top] = item ;

}

/* removes an element from the stack */

int pop ( struct stack *s )

{

int data ;

if ( s -> top == -1 )

{

printf ( "\nStack is empty." ) ;

return NULL ;

}

data = s -> arr[s -> top] ;

s -> top-- ;

return data ;

}