62. Validate Configuration Register Layout

You are given a ConfigRegister struct that simulates a 16-bit configuration register.
Each bit in the register has a specific meaning:

Your task is to validate the register:

• Return 1 if:
  • Bit 0 is set (Enable ON)
  • Bits 2–3 contain a valid priority (not 11)
  • All bits 4–15 are 0
• Return 0 otherwise

Use pointer logic (-> or (*ptr).field) to access the data.
 

Example-1

Input: reg = 0x0005 (binary: 0000000000000101)
Output: 1

(Enable = 1, Mode = 0, Priority = 01 → Valid)

Example-2

Input: reg = 0x000B (binary: 0000000000001011)
Output: 1

Example-3

Input: reg = 0x0015 (binary: 0000000000010101)
Output: 0

(Bit 4 is set → Reserved violation)