stack_example

#include <stdlib.h>
#define STACK_MAX_SIZE 50
#define STACK_OVERFLOW 1
#define STACK_UNDERFLOW 0
typedef int T;


typedef struct Stack_tag {
    T data[STACK_MAX_SIZE];
    size_t size;
} Stack_t;

void push(Stack_t *stack, const T value) {
    if (stack->size >= STACK_MAX_SIZE) {
        exit(STACK_OVERFLOW);
    }
    stack->data[stack->size] = value;
    stack->size++;
}

T pop(Stack_t *stack){
    if (stack->size == 0) {
        exit(STACK_UNDERFLOW);
    }
    stack->size--;
    return stack->data[stack->size];
}

T peek(Stack_t* stack){
    if (stack->size <= 0) {
        exit(STACK_UNDERFLOW);
    }
    return stack->data[stack->size - 1];
}