7.2 - Go Variables

Variables

Variable declaration

var intNum int // (variable declaration) (name) (type)

Variable types

Types	Details	Default value
int / int8 / int16 / int32 / int64	Indicate how many bits we want to allocate to store the integer	0
uint / uint8 / uint16 / uint32 / uint64	Unsigned integers to only store positive values, can store twice the amount of integers	0
float32 / float64	-	0
string	Use double quotes or backquotes len("$\gamma$") gives 2 because GO uses utf-8 encoding, so we can use the import ‘unicode/utf8’ and use the utf8.RuneCountInString to count the length	""
rune	Use single quotes	”
bool	-	false

• We cannot do mathematical operations on different types, such as adding int to float32 is not allowed, though we can type cast one of them
• Division is rounded down
• We can also use type inference instead of declaring the type, var myVar = "text"
• Declaration and assignment: myVar := "text"
• const means declaring a variable that we cannot change after its created, and must be initialised with value