In the this section, you will use these operators in conditional expressions to make decisions in the program. For example, you can check whether the user has entered the correct password using the equality operator, or determine if a person has access to a specific resource based on their age (as in the example with user age >= 18 ). In such cases, the result of the comparison becomes a bool value, which helps you make decisions in your program based on conditions.

Operator	Meaning
`==`	equal
`!=`	Not equal
`>`	Greater than
`<`	Less than
`>=`	Greater than or equal to
`<=`	Less than or equal to

In this сhapter, we will learn how to store a bool value that will be computed based on whether the condition is true or false.

Examples

main


              1234
            
void main() { 
   bool info = 10 > 2;   // `true`
   print(info);
}

10 > 2 is a true statement, so we see the result as true.

main


              12345
            
void main(){
  String day1 = 'Monday';
  String day8 = 'Monday'; 
  print(day1 == day8);  // `true` 
}

The variables day1 and day8 store the same values, so we get true as a result of the comparison.

Note

There are two equal (==) signs here because a single equal sign (=) has a completely different meaning. It is used for assignment and cannot (and does not make sense) to be used in if blocks.

Data Type Checking

The following operators do not check the value of the variable. They check the data type of the value.

Operator	Meaning
`is`	`true` if the value has the specified type
`is!`	`false` if the value has the specified type

main


              123
            
void main() { 
   print(4.2 is int);
}

We get false because 4.2 is of the double type.

Tasks

1. 4 != 5

2. 6 <= 6 + 3

3. 4 == 2 + 2

4. var test = 33 is String;

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Seção 2. Capítulo 4