86. Circular Buffer Read

#include <stdio.h>
#include <stdbool.h>

typedef struct {
    int buffer[10];
    int head;
    int tail;
    int count;
    int capacity;
} CircularBuffer;

bool buffer_pop(CircularBuffer *cb, int * value) 
{
    if (cb -> count == 0)
    {
        return false;
    }

    *value = cb->buffer[cb->tail];
    cb->tail = (cb->tail + 1) % 10;
    cb->count--;

    return true;
}

void read_bytes(CircularBuffer *cb, int n) {
    // Your logic here
    for(int i = 0; i < n; i++)
    {
        int value;
        if (buffer_pop(cb, &value))
        {
            printf("%d", value);
        }
        else
        {
            printf("%s", "NULL");
        }

        if (i < n - 1)
        {
            printf(" ");
        }
    }

    printf("\nTail: %d", cb->tail);
}

int main() {
    CircularBuffer cb = {
        .buffer = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100},
        .head = 3,
        .tail = 7,
        .count = 6,
        .capacity = 10
    };

    int n;
    scanf("%d", &n);
    read_bytes(&cb, n);

    return 0;
}