12. Set Specific Bits in a 32-bit Register

You are working with a 32-bit configuration register. Set a few bits starting from a given position and covering a specific length. The bits must be set to 1 (ON), without affecting other bits in the register.

Use 0-based indexing.

Example 1

Input: reg = 0b0000 0000 0000 0000 0000 0000 0000 0000, pos = 4, len = 3  
Output: 0b0000 0000 0000 0000 0000 0000 0111 0000

Example 2

Input: reg = 0b0000 0000 0000 0000 0000 0000 0000 0001, pos = 1, len = 2  
Output: 0b0000 0000 0000 0000 0000 0000 0000 0111