#include <stdio.h>
#include <stdlib.h>
#define SIZE 50
void push(int i);
int pop(void);
int *tos, *p1, stack[SIZE];
int main(void)
{
int value;
tos = stack; /* tos points to the top of stack */
p1 = stack; /* initialize p1 */
do {
printf("Enter value: ");
scanf("%d", &value);
if(value != 0) push(value);
else printf("value on top is %d\n", pop());
} while(value != -1);
return 0;
}
void push(int i)
{
p1++;
if(p1 == (tos+SIZE)) {
printf("Stack Overflow.\n");
exit(1);
}
*p1 = i;
}
int pop(void)
{
if(p1 == tos) {
printf("Stack Underflow.\n");
exit(1);
}
p1--;
return *(p1+1);
}
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