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) {
    // Your logic here
    static int arr[MAX];
    int index = 0;
    char type[20] = "push";
    for(int i = 0; i < n; i++){
        char str[20];
        scanf("%s", str);
        if(strcmp(str, type) ==  0){
            int value;
            scanf("%d", &value);
            if(index == MAX){
                printf("Stack Overflow\n");

            }
            else{
                arr[index] = value;
                index++;
            }
            
        }
        else {
            index--;
            if(index < 0){
                printf("Stack Underflow");
                index = 0;
            }
            else {
                printf("%d", arr[index]);
            }
            
            if(i < (n -1)) {
                printf("\n");
            }
        }
        getchar();   
    }
}

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

    process_stack(n);
    return 0;
}

Solving Approach