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

    char cmd[20];

    for(int i = 0; i < n; i++) {
        fgets(cmd, sizeof(cmd), stdin);

        if(strncmp(cmd, "push", 4) == 0) {
            int val;
            sscanf(cmd + 5, "%d", &val);  // đọc số sau "push "
            if(top >= MAX - 1) {
                printf("Stack Overflow\n");
            } else {
                top++;
                stack[top] = val;
            }
        } else if(strncmp(cmd, "pop", 3) == 0) {
            if(top == -1) {
                printf("Stack Underflow\n");
            } else {
                printf("%d\n", stack[top]);
                top--;
            }
        }
    }
}

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

    process_stack(n);
    return 0;
}

Solving Approach