Implement Stack Using Array with Push and Pop Operations

Code

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

#define MAX 10

typedef struct {
    int buffer[MAX];
    int head;
} Stack;

void initialize(Stack* s) {
    s->head = -1;
}

void push(Stack* s, int value){
    if (s->head >= (MAX - 1)) {
        printf("Stack Overflow\n");
    } else {
        s->head++;
        s->buffer[s->head] = value;
    }
}

void pop(Stack* s) {
    if (s->head < 0) {
        printf("Stack Underflow\n");
    } else {
        printf("%d\n", s->buffer[s->head--]);
    }
}

void process_stack(int n) {
    // Your logic here
    Stack s = {0};
    char cmd[10];
    int value;

    initialize(&s);

    for (int i = 0; i < n; i++) {
        scanf("%s", cmd);

        if (strcmp(cmd, "push") == 0) {
            scanf("%d", &value);
            push(&s, value);
        } else {
            pop(&s);
        }

    }
}

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

    process_stack(n);
    return 0;
}

Solving Approach

Stack is more simple than Circular Queue

my logic is similar to the solution