Chapter 03 — Operators and Expressions

Level: beginner Estimated time: 3 hrs Prerequisites: Chapter 02 — Variables, Constants, and Types What you will be able to do by the end: write calculations, comparisons, and complete Boolean expressions that are ready to be reused in conditions.

03.0 — Chapter objectives

By the end of this chapter, you will be able to:

• perform calculations with Dart;
• use arithmetic operators;
• understand integer division;
• calculate a remainder with %;
• quickly modify a variable with +=, -=, *=, /=;
• use ++ and --;
• compare values;
• create Boolean expressions;
• use the logical operators &&, ||, and !;
• understand operator precedence;
• use the ternary operator;
• build expressions that will then be used with if, else, and switch.

03.1 — What is an operator?

An operator is a symbol that performs an operation.

Example:

int resultat = 10 + 5;

In this statement:

10 + 5

the symbol:

+

is an operator.

The values:

10
5

are the operands.

We can therefore represent: