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863HUXLEY.c
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863HUXLEY.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/// STACK USING array
#define MAX_SIZE 500
typedef struct stack stack;
struct stack
{
int item[MAX_SIZE];
int size;
};
stack* create_stack()
{
stack *new_stack = (stack*) malloc(sizeof(stack));
new_stack->size = 0;
return new_stack;
}
int empty(stack *st)
{
return (st->size);
}
void push(stack *stack, int item)
{
if(stack->size == MAX_SIZE) printf("TA CHEIA JA PO!!\n");
stack->item[stack->size++] = item;
}
void pop(stack *st)
{
if(empty(st)) { printf("TA VAZIA MEU CARO\n"); }
else
{
st->size--;
}
}
int peek(stack *st)
{
if(empty(st)) { printf("TA CHEIA JA PO\n"); return -1;}
return st->item[st->size-1];
}
void main()
{
stack *stack= create_stack();
stack *back = NULL;
stack *forw = NULL;// create_stack();
while(1)
{
char frase[10] = {"\0"};
gets(frase);
if(frase[0] == '\0') break;
if(!strcmp(frase, "ENTER"))
{
push(stack,1);
}
else if(!strcmp(frase, "FORWARD"))
{
push(back,1);
pop(forw);
}
else if(!strcmp(frase, "BACK"))
{
pop(back);
push(forw,1);
}
}
printf("BACK: %d\nFORWARD: %d\n", back->size, forw->size);
free(stack);
free(back);
free(forw);
}