Lesson 8 +10 XP

C# Data Types

C# Data Types

A data type specifies what kind of value a variable holds. C# is strongly typed: every variable has a declared type.

The main data types

Type	Kind	Example
`int`	whole numbers	`int x = 5`
`long`	very large whole numbers	`long x = 15000000000`
`double`	decimal numbers	`double x = 5.99`
`float`	decimal (smaller precision)	`float x = 5.99F`
`decimal`	high-precision decimal	`decimal x = 5.99M`
`char`	single character	`char x = 'A'`
`string`	sequence of characters	`string x = "Hello"`
`bool`	true or false	`bool x = true`

Number types

Use int for most whole numbers. If numbers get very large, use long. For decimals:

float - precision to about 7 digits, suffix F.
double - precision to about 15 digits (default for decimals).
decimal - precision to 28-29 digits, suffix M, best for money.

float myFloat = 5.75F;
double myDouble = 19.99;
decimal myDecimal = 19.99M;

Text types

char holds exactly one character in single quotes; string holds any text in double quotes.

char grade = 'A';
string name = "Ada";

bool

bool stores true or false - perfect for on/off decisions.

TL;DR

int, long for whole numbers.
float, double, decimal for decimals.
char for one character, string for text.
bool for true/false.