C# Basics

Variables, types, control flow and methods — the building blocks of every program.

1. 1.1

   Variables & types

   • int, double, bool, char
   • var
   • Constants
   • Type conversion
   • Variables and types— Store values in named variables and pick the right type for each kind of data.12 min
2. 1.2

   Operators & strings

   • Arithmetic & logic
   • String interpolation
   • String methods
   • Operators and expressions— Do math and logic in C# — and avoid the classic integer-division trap.11 min
   • Working with strings— Build, inspect and transform text with string methods, interpolation and StringBuilder.12 min
3. 1.3

   Control flow

   • if / else
   • switch
   • Ternary operator
   • Making decisions with if / else— Run different code depending on conditions, from simple checks to chains of rules.10 min
   • switch statements and expressions— Choose between many options cleanly with switch statements and modern switch expressions.9 min
4. 1.4

   Loops & arrays

   • for, while, foreach
   • Arrays
   • break / continue
   • Loops: for, while and foreach— Repeat work with for, while, do-while and foreach — and control loops with break and continue.12 min
   • Arrays— Store many values of the same type in one variable and process them with loops.11 min
5. 1.5

   Methods

   • Parameters & return values
   • Overloading
   • ref / out
   • Debugging basics
   • Writing methods— Package code into reusable, named methods with parameters and return values.12 min
   • ref, out and params— Control how arguments are passed — by value, by reference, as outputs, or as a variable-length list.10 min
   • Reading errors and debugging— Tell compile errors, runtime exceptions and logic bugs apart, and track each one down.10 min