17. Extract the Nibble from an 8-bit Register

Write a C program to extract a nibble (4-bit value) from an 8-bit register.

• The user provides an 8-bit integer (register value) and a nibble position (0 for lower nibble, 1 for upper nibble).
• Your task is to extract and print the nibble’s decimal value.

Input Format

• An 8-bit integer (0-255) representing the register value.
• A nibble position (0 for lower, 1 for upper).

Output Format

• The extracted 4-bit value (0-15).

Example-1

Input: reg = 0xAB, pos = 0
Output: 11
(0xAB → lower nibble = 0xB = 11)

Example-2

Input: reg = 0xAB, pos = 1
Output: 10
(0xAB → upper nibble = 0xA = 10)

Example-3

Input: reg = 0xFF, pos = 0
Output: 15