Circular Buffer Read

Code

#include <stdio.h>

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

void read_bytes(CircularBuffer *cb, int n) {
    // Your logic here
    while (n--) {
        if ((cb->count--) > 0) {
            printf("%d", cb->buffer[cb->tail]);
            ++(cb->tail) %= cb->capacity;
        } else
            printf("NULL");
        if (n)
            printf(" ");
    }
    printf("\n");
    printf("Tail: %d\n", 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;
}

Solving Approach