Difference between a = a + b and a += b expressions.

The Difference: Implicit Casting

1. a = a + b:

• Performs addition and requires manual casting if types differ.
• Example:
  byte a = 10;
  a = a + 5; // Compilation Error (Result is int)
  a = (byte)(a + 5); // Correct

2. a += b:

• Performs the operation and automatically casts the result to the type of 'a'.
• Example:
  byte a = 10;
  a += 5; // Valid. Automatically casts result to byte.