88. Implement Stack Using Array with Push and Pop Operations

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

#define MAX 10

void process_stack(int n) {
    // Your logic here
    int stack[MAX];
    int STACK_SIZE = MAX, S_HEAD = -1, value;
    for(int i=0; i<n; i++)
    {
        char instr[MAX];
        scanf("%s", instr);
        if(!strcmp(instr, "push"))
        {
            scanf("%d", &value);
            if(S_HEAD<STACK_SIZE-1)
                stack[++S_HEAD] = value;
            else    
                printf("Stack Overflow\n");
        }
        else if(!strcmp(instr, "pop"))
        {
            if(S_HEAD<0)
                printf("Stack Underflow\n");
            else
                printf("%d\n", stack[S_HEAD--]);
        }
    }
}

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

    process_stack(n);
    return 0;
}