Lesson 49 +10 XP

Cheatsheet: Common Types & Converters

Cheatsheet: Common Types & Converters

The everyday types and the tools to convert between them.

Value types

Type	Holds	Example
`int`	whole numbers	`int x = 5`
`long`	big whole numbers	`long x = 15000000000L`
`double`	decimals	`double x = 5.99`
`float`	decimals (less precision)	`float x = 5.99F`
`decimal`	high-precision decimals	`decimal x = 5.99M`
`char`	one character	`char x = 'A'`
`bool`	true/false	`bool x = true`

Reference types

Type	Holds	Example
`string`	text	`string s = "Hi"`
`object`	anything	`object o = 5`
arrays / collections	groups	`int[] a = {1,2}`

Converters

Task	Tool
string -> int	`int.Parse(s)`, `Convert.ToInt32(s)`
any -> string	`Convert.ToString(x)`, `x.ToString()`
int -> double	implicit, or `Convert.ToDouble`
double -> int	`(int) x` (truncates)

Numeric suffixes

5F float, 5M decimal, 5L long, 5D double.

TL;DR

Value types hold data directly; reference types hold references.
int.Parse and Convert handle conversions.
Suffixes mark float/decimal/long literals.