68. Circular Buffer Read

You are working with a pre-filled circular buffer of 10 elements.

The buffer is structured as:

typedef struct {
    int buffer[10];
    int head;        // Write pointer
    int tail;        // Read pointer
    int count;       // Number of unread bytes
    int capacity;    // Always 10
} CircularBuffer;

Your Task

Implement this function:

void read_bytes(CircularBuffer *cb, int n);

This function should:

• Read and print n values from the buffer
• If there are fewer than n values, print "NULL" in place of missing ones
• Advance the tail properly with wrap-around
• Decrease count after each successful read
• After reading, print the new value of the tail index on a new line
  
   

Example-1

Input: n = 4
Initial Buffer:
buffer = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
head = 3
tail = 7
count = 6
Output:
80 90 100 10
Tail: 1

Example-2

Input: n = 5
Same setup, but count = 2
Output:
80 90 NULL NULL NULL
Tail: 9