Circular Buffer Read

Read and print value. Include spaces.

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

Solving Approach

use a loop to iterate and print n elements. Check for count and wrap around for tail by using tail = tail % capacity. Increment tail and decrement count. Print spaces only till the last 2nd element then use \n to print tail value.