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

        }
        
        n--;
    }
    printf("\n%s%d","Tail: ",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