Statements about brackets in if

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What is true about brackets in if expression?

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We must use curly braces if we have several statements inside if or else branch.

When we want to return the if result as an expression, we must omit curly braces.

When we use if not as an expression we must include curly braces.

We can omit round brackets around boolean condition if we use if as an expression.

When we want to use if without else branch we must include curly braces.

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