C # for beginner session ten to 20

Session 11-12 switch statement in C #

Switch statement

Break statement If break statement is used inside a switch statement,he control would leave the switch statemen T

Goto statement You can either jump to another case statement,or to specific label (label are some word you codin G to mark).

Warning:using Goto is bad programming style,we can should avoid go to by all means

Multiple if Else statements can be replaced with a switch statement

For an excample:

if (number ==10)

{Console.WriteLine ("You are 10");}

else if (number ==20)

{Console.WriteLine ("You are 20");}

else if (number ==30)

{Console.WriteLine ("You are 30");}

Else

{Console.WriteLine ("You are not 30");}

Above code can replaced as:

Switch (number)

{

Case:10

Console.WriteLine ("You are 10");

Break

Case:20

Console.WriteLine ("You are 20");

Break

Case:30

Console.WriteLine ("You are 30");

Break

Defalut:

Console.WriteLine ("You are not 30");

}

Or can be replaced as:

Switch (number)

{

Case:10

Case:20

Case:30

Console.WriteLine ("You Number is{0}", number);

Default

Console.WriteLine ("You are not 30");

}

noted that switch (expression), expression value must is bool, char, string, int, enum, or nullable type.

Session when loop in C #

1,while Loop checks the condition first.

2,if the condition is true,statements with in the loop is executed.

3,this process is repeated as long as the condition evaluetes to true.

Note:don ' t forget to update the variable participating in the Condition,so the loop can end, at some point

Session and Loop in C #

1,a Do loop checks it condition at the end of the loop.

2,this means that does loop is guranteed-to-execute at least one time.

3,do loops is used to present a menu to the user

Difference-while & Do While

1,while Loop checks the condition at the beginning, where as does while loops checks the condition at the end of the loop.

2,do loop is guaranteed-to-execute at least once, where as while loop was not

C # for beginner session ten to 20