C # judgment

Judging the structure requires the programmer to specify one or more conditions to evaluate or test, and the statement to execute when the condition is true (required) and the statement to be executed when the condition is false (optional).

The following is the general form of a typical judgment structure in most programming languages:

Judgment statement

C # provides the following types of judgment statements. Click the link to see the details of each statement.

Statement	Description
If statement	An If statement consists of a Boolean expression followed by one or more statements.
If...else statements	An if statement can follow an optional else statement , and the Else statement executes when the Boolean expression is false.
Nested IF statements	You can use another if or else if statement within an if or else if statement.
Switch statement	A switch statement allows you to test what happens when a variable equals multiple values.
Nested switch statements	You can use another switch statement within a switch statement.

? : operator

We have explained the conditional operatorin the previous section: it can be used instead of the if...else statement. Its general form is as follows:

Exp1?  EXP2:Exp3;    

Among them, EXP1, EXP2, and Exp3 are expressions. Notice the use and position of the colon.

? The value of an expression is determined by EXP1. If EXP1 is true, the value of EXP2 is computed and the result is the whole? The value of an expression. If EXP1 is false, the value of EXP3 is computed and the result is the whole? The value of an expression.

C # judgment