3.4-Assigning Values

Question 1

How to master Operators?

Answer 1

-> You should understand 💥️Numeric Promotion💥️ … and when 💥️Casting💥️ is required

Question 2

What is Casting?

Answer 2

-> It’s a unary operation where one data type is implicitly/explicitly converted as another data type.

Question 3

When is Casting optional and when it’s mandatory?

Answer 3

🚀️ Casting is unnecessary when converting to a larger or widening data type
🚀️ But it is mandatory when converting to a smaller or narrowing data type.
[Over/Under Flow]

Question 4

What is the syntax for Casting in Java?

Answer 4

-> By placing the type, enclosed in parentheses, to the left of the value you want to cast.
// DOES NOT COMPILE >>>
❌short s = 13 * 5;  
❌float f = 2.0 / 1;

// DOES COMPILE
✅short s = (short) (13 * 5);  
✅float f = (float)2.0 / 1;

Question 5

What is the Compound assignment operator PITFALL case?

Answer 5

🤯️⚠️📣️ Compound assignment operator cannot be used when inline declaration.

🧠️ Compound assignment operators automatically perform internally type-casting.

Question 6

📝️ What does the assignment operator returns?

Answer 6

It returns the value of the assignment