88. Implement Stack Using Array with Push and Pop Operations

#include <stdio.h>
#include <stdint.h>
#include <string.h>

#define MAX 10

int stack[MAX];
int top = -1;

void push(int x) {
    if (top >= MAX - 1) {
        printf("Stack Overflow\n");
    } else {
        stack[++top] = x;
    }
}

void pop() {
    if (top < 0) {
        printf("Stack Underflow\n");
    } else {
        printf("%d\n", stack[top--]);
    }
}

void process_stack(int n) {
    char line[20];
    for (int i = 0; i < n; i++) {
        fgets(line, sizeof(line), stdin);

        if (strncmp(line, "push", 4) == 0) {
            int x;
            sscanf(line + 5, "%d", &x); // Extract number after "push "
            push(x);
        } else if (strncmp(line, "pop", 3) == 0) {
            pop();
        }
    }
}

int main() {
    int n;
    scanf("%d", &n);
    getchar(); // Consume newline after number

    process_stack(n);
    return 0;
}