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;

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

        // Remove trailing newline
        op[strcspn(op, "\n")] = '\0';

        if (strncmp(op, "push", 4) == 0) {
            int x;
            sscanf(op + 5, "%d", &x);  // read the number after "push "
            if (top == MAX - 1) {
                printf("Stack Overflow\n");
            } else {
                stack[++top] = x;
            }
        } else if (strcmp(op, "pop") == 0) {
            if (top == -1) {
                printf("Stack Underflow\n");
            } else {
                printf("%d\n", stack[top--]);
            }
        }
    }
}



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

    process_stack(n);
    return 0;
}

Solving Approach