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Introduction to Dart
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Introduction to Dart

Introduction to Dart

1. First Acquaintance with Dart
About DartFirst ApplicationFunction print()CommentsBasic Math Operations
2. Variables and Data Types
Data TypesVariablesProperties of NumbersBool, Equality and Relational Operators
3. Conditional Statements
if Statementif...else Statementelse-if Statementswitch-sase Statement
4. List and String
ListIndexesStringWhat are Methods?String Properties and Methods
5. Loops
Introduction to Loopswhile-LoopsDo-whilefor-LoopsIncrement and DecrementBreak and Continue

bookelse-if Statement

else if Statement

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

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');
  }
}

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Seção 3. Capítulo 3
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