159. Float to Bytes Type Punning

Your task is to define a union that allows viewing a 32-bit floating-point value both as a float and as its raw byte representation.

The union must contain:

• float f
• uint8_t bytes[4]

The program will:

1. Read a floating-point value from input
2. Store it in the union
3. Print the four raw bytes in memory order, as two-digit uppercase hexadecimal values separated by spaces

Input / Output Specification

Input

• A single 32-bit floating-point number in decimal notation

Output

• Four bytes printed in little-endian memory order
• Each byte printed as:
  • Two-digit
  • Uppercase hexadecimal
  • Followed by a single space

Output format example:

3F 80 00 00 

(Note: A trailing space after the last byte is required.)

Example 1

Input:

1.0

Output:

00 00 80 3F 

Example 2

Input:

-2.5 

Output:

00 00 20 C0 

⚠️ Embedded System Assumptions (Mandatory Constraints):

• The target platform uses:
  • IEEE-754 single-precision (32-bit) floats
  • Little-endian byte order
• The compiler supports union-based type punning, as is commonly allowed in embedded GCC/Clang toolchains.
• This problem is intended for embedded/firmware environments, not strictly portable ISO C++.