12. Integers
Using Natural Numbers
- Integers are used to store natural numbers are 1,2,3.
- Go has 8 types on integers
int8
,int16
,int32
, andint64
, and corresponding unsigned versionsuint8
,uint16
,uint32
, anduint64.
- unsigned integers can store positive numbers only.
- 8,16,32 and 64 represents how many bits are used to store value.
Bits | Signed | Unsigned |
8 | –128 to 127 | 0 to 255 |
16 | –32,768 to 32,767 | 0 to 65535 |
32 | –2,147,483,648 to 2,147,483,647 | 0 to 4,294,967,295 |
64 | –9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 | 0 to 18,446,744,073,709,551,615 |
Integers are declared using one of the 3 ways:
main.go
var j int32 = 20
var i int = 10
var i = 10
i := 10
var k int
If we are not specifying type like in 2nd and 3rd declaration, it will default to
int
Zero value for integer is
0
Always use short declaration way when assigning initial value. If you wish to initialize a variable to its zero value, use var declaration.
Learn how to do test driven development when using integers from Chris
Last modified 3yr ago