3.2-Applying Unary Operators

Question 1

What is a unary operator?

Answer 1

A unary operator is one that requires exactly one operand

Question 2

What are the Unary Operators and its precedece?

Answer 2

• > Post-Increment/Decrement operators ++ –
• > Pre -Increment/Decrement operators ++ –
• > Unary plus operator +
• > Unary minus operator -
• > Bitwise complement operator ~
• > Logical complement operator !
• > Casting operator (type)

Question 3

What does the Increment/Decrement operators, ++ and – do?

Answer 3

Respectively, can be applied to numeric operands and have a high order of precedence, as compared to binary operators.

🚀️ If the operator is placed 💥️BEFORE💥️ the operand, referred to as the pre-prefix operator.
🚀️ If the operator is placed 💥️AFTER💥️ the operand, referred to as the post-prefix operator.

Question 4

🤯️⚠️📣️ What is the Post-prefix operator PITFALL case?

Answer 4

If the operand the post-prefix is being applied to is used in both sides of an assignment-expression.
-> The variable might NOT get incremented/decremented.
e.g: int x = 10, y = 10;
🕵‍♂️️ x = x++ + y; //20 ❌
🕵‍♂️️ x = x++ + y + x++; //31 ✅

Question 5

What does the negation/minus operator, ‘-‘ do?

Answer 5

Reverses the sign of a numeric expression.

🚀️ By default every numeric expression goes with a plus operator

Question 6

What does the logical complement operator (!) do?

Answer 6

Flips the value of a boolean expression.

Question 7

What is the Unary bitwise complement symbol, what operation it performs?

Answer 7

bitwise complement ~ -> -(N +1) e.g: ~5 => -6