I'll tell you why people would rather see 0.

Let's talk about the if branch structure first!

If(express) statement 1

Else statement 2

When express is true, the statement 1 is executed, and when express is false, the statement 2 is executed. Obviously, it can only be one statement, so if you want to use more than one statement, you must use {} to represent the statement block!

Look back.

If(express 1) statement 1

Else if(express2) statement 2

Else statement 3

Because an if structure can be called a compound statement! So, in this nested if, the second if is a statement, so, and.

If(express 1) statement 1

If(express2) statement 2

Else statement 3

Obviously different!

The former is a statement with the second if as the else branch of the first if, and the latter is a compound statement with two if branches in parallel!