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Introduction to Dart
course content

Course Content

Introduction to Dart

Introduction to Dart

1. First Acquaintance with Dart
Dart OverviewYour First Dart ApplicationFunction print() in DartDart CommentsBasic Math Operations
2. Variables and Data Types in Dart
Data Types in DartVariables in DartProperties of Numbers in DartString in DartBool, Equality and Relational Operators in DartList in DartIndexes in Dart
3. Conditional Statements
if Statement in Dartif...else Statement in Dartelse-if Statement in Dartswitch-case Statement in Dart
4. Loops in Dart
Introduction to Loopswhile Loop in Dartdo while Loop in DartFor-Loop in DartIncrement and Decrementbreak and continue

book
else-if Statement in Dart

The else…if statement is useful to test multiple conditions. Following is the syntax of the same.

  • An if construct can contain any number of else if blocks of code;

  • It is not necessary to use the code block else.

Syntax

javascript

The else if syntax is like the if syntax:

else if keyword, value in the parentheses () and a code block in the curly brackets {}.

If one of the conditions is met, then after executing its code block, the subsequent conditions will not be checked, and the code blocks of those conditions will not be executed either.

Example

dart

main

copy

              
123456789101112

            
void main() {
  int num = 2;
  if(num > 0) {
    print("is positive");
  }
  else if(num < 0) {
    print("is negative");
  }
  else {
    print("is zero");
  }
}

In this program, we have a variable num which is equal to 2. We use a conditional statement if to check if num is greater than 0. If this condition is true (meaning num is a positive number), it prints the message "is positive". Otherwise, if num is less than 0, it prints "is negative". If none of these conditions is true (i.e., num is equal to 0), it prints "is zero".

Task

Fix the code so that the program works correctly.

dart

main

copy

              
12345678910

            
void main() {
  var score = '2.0';
  if( score is int ){
    print('Type: int');
  } ___ (___){
    print('Type: double');
  } else {
    print('Type: other type');
  }
}

else if (score is double) - correct condition

dart

main

copy

              
12345678910

            
void main() {
  var score = '2.0';
  if( score is int ){
    print('Type: int');
  } else if (score is double){
    print('Type: double');
  } else {
    print('Type: other type');
  }
}

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 3. ChapterΒ 3

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course content

Course Content

Introduction to Dart

Introduction to Dart

1. First Acquaintance with Dart
Dart OverviewYour First Dart ApplicationFunction print() in DartDart CommentsBasic Math Operations
2. Variables and Data Types in Dart
Data Types in DartVariables in DartProperties of Numbers in DartString in DartBool, Equality and Relational Operators in DartList in DartIndexes in Dart
3. Conditional Statements
if Statement in Dartif...else Statement in Dartelse-if Statement in Dartswitch-case Statement in Dart
4. Loops in Dart
Introduction to Loopswhile Loop in Dartdo while Loop in DartFor-Loop in DartIncrement and Decrementbreak and continue

book
else-if Statement in Dart

The else…if statement is useful to test multiple conditions. Following is the syntax of the same.

  • An if construct can contain any number of else if blocks of code;

  • It is not necessary to use the code block else.

Syntax

javascript

The else if syntax is like the if syntax:

else if keyword, value in the parentheses () and a code block in the curly brackets {}.

If one of the conditions is met, then after executing its code block, the subsequent conditions will not be checked, and the code blocks of those conditions will not be executed either.

Example

dart

main

copy

              
123456789101112

            
void main() {
  int num = 2;
  if(num > 0) {
    print("is positive");
  }
  else if(num < 0) {
    print("is negative");
  }
  else {
    print("is zero");
  }
}

In this program, we have a variable num which is equal to 2. We use a conditional statement if to check if num is greater than 0. If this condition is true (meaning num is a positive number), it prints the message "is positive". Otherwise, if num is less than 0, it prints "is negative". If none of these conditions is true (i.e., num is equal to 0), it prints "is zero".

Task

Fix the code so that the program works correctly.

dart

main

copy

              
12345678910

            
void main() {
  var score = '2.0';
  if( score is int ){
    print('Type: int');
  } ___ (___){
    print('Type: double');
  } else {
    print('Type: other type');
  }
}

else if (score is double) - correct condition

dart

main

copy

              
12345678910

            
void main() {
  var score = '2.0';
  if( score is int ){
    print('Type: int');
  } else if (score is double){
    print('Type: double');
  } else {
    print('Type: other type');
  }
}

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 3. ChapterΒ 3
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