Implement Stack Using Array with Push and Pop Operations

Code

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

#define MAX 10
int head = -1;
int arr[MAX];

void push(int data)
{
    if(head == 9) printf("Stack Overflow\n");
    else{
        head++;
        arr[head]= data;
    }
}

void pop()
{
    if (head == -1) printf("Stack Underflow\n");
    else{
        printf("%d\n",arr[head]);
        head--;
    }
}
void process_stack(int n) {
    // Your logic here
    char str[5];
    int a;
    int i;
    for(i=0;i<n;i++){
        scanf("%s",str);
        scanf("%d",&a);
        if(str[1] == 'u'){
            push(a);
        }
        else{
            pop();
        }
    }
}


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

    process_stack(n);
    return 0;
}

Solving Approach