C + + Fourth Lesson selection structure

First, if statement:

The first case of a 1.if statement:

An if (expression) statement

The second form of the 2.if statement:

if (expression) statement 1

Else Statement 2

The third form of the 3.if statement:

if (expression 1) Statement 1

else if (expression 2) Statement 2

else if (expression 3) statement 3

else if (expression 4) Statement 4

Else Statement 5

Second, switch statement:

switch (expression)

{

Case constant Expression 1:< statement sequence 1>

Case constant Expression 2:< statement sequence 2>

...//Other case branches

Case constant Expression n:< statement sequence n>

default:< Statement Sequence n+1>

}

The sequence of statements for adjacent case branches is stored next to each other, executes a sequence of statements for a case branch, does not automatically end the case statement, but executes subsequent branches. So, add the statement "break;" Used to jump out of a switch statement and go to execute a subsequent statement.

Three, Boolean type:

The Boolean type name is bool and has a value of only two: true and false.

True is a Boolean constant that represents the truth value; False constants represent false values.

C + + Fourth Lesson selection structure