Primitive Data Types (Basic Data Types)
string
bool
float32 // no default. float64 is accurate to 6 digits. Using period 22. is a good habit (no numeric conversion)
float64 // no default. float64 is accurate to 15 digits. Using period 22. is a good habit (no numeric conversion)
int, int8, int16, int32, int64 // Int is the default
uint, uint8, uint16, uint32, uint64, uintptr
byte // alias for uint8
rune // alias for int32
complex64 complex128
Integer Types
The predefine architecture-independent integer types are:
| S.N. | Types and Description |
|---|---|
| 1 | uint8 Unsigned 8-bit integers (0 to 255) |
| 2 | uint16 Unsigned 16-bit integers (0 to 65535) |
| 3 | uint32 Unsigned 32-bit integers (0 to 4294967295) |
| 4 | uint64 Unsigned 64-bit integers (0 to 18446744073709551615) |
| 5 | int8 Signed 8-bit integers (-128 to 127) |
| 6 | int16 Signed 16-bit integers (-32768 to 32767) |
| 7 | int32 Signed 32-bit integers (-2147483648 to 2147483647) |
| 8 | int64 Signed 64-bit integers (-9223372036854775808 to 9223372036854775807) |
Aggregate types
array, structs
Reference types
pointers, slices, maps, func, channels
Interface types
An interface type specifies a set of methods that a concrete type must possess to be considered an instance of that interface.
Use of types
Types provide the compiler two informations: how much memory to allocate and what the memory represents
int64: 8byte, 64bits
int32: 4byte, 32bits
bool: 1byte, 8bits