Lan Unity Development Foundation--switch Statement Learning Notes

One, switch syntax

is a multi-branch statement that determines which branch to execute by judging the value of an expression

B Reak is used to end a case and then execute a statement other than switch

S witch-switch: case-condition switch determines what happens

Second, switch basic syntax

S Witch (expression) {

C ASE value 1:

Statement 1

B reak;

C ASE value 2:

Statement 2

B reak;

......

C ASE value N:

Statement n

B reak;

D Efault:

Statement

B reak;

}

Third, the matters needing attention

The entire Defaul statement can be dropped, the default statement up to a maximum of one

S Witch (expression), the expression value inside cannot be a floating-point number

Multiple case can execute the same block of statements, the position of case can also be arbitrary

C You must add a break if you have a statement behind your ASE, or you will get a syntax error

C the label behind the ASE can only be a constant or constant expression, with a specific value, not a variable as a label for the case.

Example: in console input 1, print "January", enter 2 print "February", enter 3, print "March", enter other print "Other month"

               //switch
            Switch(a) {
             Case 1:
                Console. WriteLine (" January " );
                 Break;
             Case 2:
                Console. WriteLine (" February " );
                 Break;
             Case 3:
                Console. WriteLine (" March " );
                 Break;
            default:
                // to handle the above situation is not satisfied, need to execute the code
                Console. WriteLine (" Other months " );
                 Break
            }

Four, the difference between switch and if

I both F and switch are the most common grammars in real-world development.

I the expression value of the F statement is generally of type bool

S Witch statements usually have the execution of a break end Case statement

Exercise: Enter 1-7 from the console to print the corresponding day of the week via switch

Lan Unity Development Foundation--switch Statement Learning Notes