Implement Stack Using Array with Push and Pop Operations

Code

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

#define MAX 10

void process_stack(int n) {
    int arr[MAX];
    char op[10];
    int val;
    int capacity = -1;
    
    for (int i = 0; i < n; i++) {
        scanf("%s", op);
        if(strcmp(op, "push") == 0) {
            scanf("%d", &val);
            if (capacity >= MAX - 1)
                printf("Stack Overflow\n");
            else {
                arr[++capacity] = val;
            }
        }
        else if (strcmp(op, "pop") == 0) {
            if (capacity < 0)
                printf("Stack Underflow\n");
            else {
                printf("%d\n", arr[capacity--]);
            }
        }
    }
}

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

    process_stack(n);
    return 0;
}

Solving Approach