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Introduction to Dart
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Зміст курсу

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

bookBasic Math Operations

Numbers

You already know how to use the print() function. We used to output text, but what about numbers and mathematical calculations?

Remember to use print() if you want to display your data. Also, there is no need to use quotes (" " or ' ') since we are evaluating a mathematical expression this time.

dart

main

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void main() {
  print('Two');   // string 
  print('2');     // string   
  print(2);       // number    
}

Math Operations

Almost no program can do without mathematical calculations, so Dart supports the following mathematical operations:

  • + – addition;
  • - – subtraction;
  • / – division;
  • * – multiplication;
  • % - get the remainder of an integer division (modulo).
dart

main

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void main() {
  print(1+2);  // adding numbers
  print(9-3); // subtracting numbers
  print(4/2); // division of numbers
  print(4*2); // multiplication of numbers
  print(5%2); // Get the remainder from the whole division of 5 by 2
}

Math Expressions

We also can write math expressions. The sequence of actions will work the same as in mathematics, where 2+2*2 = 6, because the multiplication is done before the addition.

dart

main

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123

            
void main() {
  print(2+2*2); // Output 6
}
Select the correct numbers multiplication.

Select the correct numbers multiplication.

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