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Introduction to Dart

bookif...else Statement in Dart

This image illustrates the basic structure of a conditional statement in programming:

First, the code runs and a condition is checked. If the condition is true, the if block executes; if false, the else block runs. After that, the program continues with the next part of the code, allowing it to make decisions based on conditions.

if (condition)
{
    // Code block `if` condition is `true`
}
else
{
    // Code block `if` condition is `false`
}

An if can be followed by an optional else block. The else block will execute if the Boolean expression tested by the if block evaluates to false.

main.dart

main.dart

copy

              
123456789101112

            
void main() {
  int age = 17;

  if (age >= 18) 
  {
    print("You're an adult.");
  } 
  else 
  {
    print("You're not an adult yet.");
  }
}

In the example above, the age < 18, so the if code block hasn't been executed. The else code block executes when the if condition is false. The else syntax is like the if syntax without a condition and parentheses ( ).

You can also write a condition for the if statement to check whether the variable is of type int by using is operator.

main.dart

main.dart

copy

              
123456789101112

            
void main() {
  var num = 7.0;
  
  if(num is int
  {
    print('Type: int');
  }
  else
  {
    print('Type: other type');
  }
}
question mark

Which statement best describes how the if...else statement works?

Select the correct answer

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 2

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bookif...else Statement in Dart

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This image illustrates the basic structure of a conditional statement in programming:

First, the code runs and a condition is checked. If the condition is true, the if block executes; if false, the else block runs. After that, the program continues with the next part of the code, allowing it to make decisions based on conditions.

if (condition)
{
    // Code block `if` condition is `true`
}
else
{
    // Code block `if` condition is `false`
}

An if can be followed by an optional else block. The else block will execute if the Boolean expression tested by the if block evaluates to false.

main.dart

main.dart

copy

              
123456789101112

            
void main() {
  int age = 17;

  if (age >= 18) 
  {
    print("You're an adult.");
  } 
  else 
  {
    print("You're not an adult yet.");
  }
}

In the example above, the age < 18, so the if code block hasn't been executed. The else code block executes when the if condition is false. The else syntax is like the if syntax without a condition and parentheses ( ).

You can also write a condition for the if statement to check whether the variable is of type int by using is operator.

main.dart

main.dart

copy

              
123456789101112

            
void main() {
  var num = 7.0;
  
  if(num is int
  {
    print('Type: int');
  }
  else
  {
    print('Type: other type');
  }
}
question mark

Which statement best describes how the if...else statement works?

Select the correct answer

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 2
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