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) {
    for(int i = 1; i < n; i++){
        if( cb->count == 0 ){
            printf("NULL ");
        }
        else{
            printf("%d ", cb->buffer[cb->tail]);
            cb->tail = (cb->tail+1)%cb->capacity;
            cb->count += -1;
        }
    }

    if( cb->count == 0 ){
            printf("NULL");
        }
    else{
        printf("%d", cb->buffer[cb->tail]);
        cb->tail = (cb->tail+1)%cb->capacity;
        cb->count += -1;
    }

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

    return;
}

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