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;

    char line[100];

    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);
            if(top == MAX - 1) printf("Stack Overflow\n");
            else stack[++top] = x;
        }
        else if(strncmp(line, "pop", 3) == 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