Push and pop in stack

 #include <stdio.h>

#include <stdlib.h>

#define MAX 100

int stack[MAX];

int top = -1;

void push(int value) {

    if (top >= MAX - 1) {

        printf("Stack Overflow\n");

        return;

    }

    stack[++top] = value;

}

int pop() {

    if (top < 0) {

        printf("Stack Underflow\n");

        return -1;

    }

    return stack[top--];

}

int main() {

    push(10);

    push(20);

    push(30);

    printf("%d popped from stack\n", pop());

    printf("%d popped from stack\n", pop());

    printf("%d popped from stack\n", pop());

    return 0;

}