mystack.c

#include <stdio.h>
#include "mystack.h"

void push(Stack *S, char val)
{
    S->v[ (S->top)++ ] = val;
}

char pop(Stack *S)
{
    return (S->v[ --(S->top) ]);
}

char showtop(Stack *S)
{
    return (S->v[ S->top - 1]);
}

void init(Stack *S)
{
    S->top = 0;
}

int empty(Stack *S)
{
    return (S->top == 0);
}

void StackPrint(Stack *S)
{
    int i;
    if (S->top == 0)
        printf("Stack is empty.\n");
    else
    {
        printf("Stack contents: ");
        for (i = 0; i < S->top; i++)
        {
            printf("%d ", S->v[i]);
        }
        printf("\n");
    }
}