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12. Integers
Using Natural Numbers
Integer Types
- 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
Declaring Integers
Integers are declared using one of the 3 ways:
main.go
1
var j int32 = 20
2
var i int = 10
3
var i = 10
4
i := 10
5
var k int
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If we are not specifying type like in 2nd and 3rd declaration, it will default to
intZero value for integer is
0Always use short declaration way when assigning initial value. If you wish to initialize a variable to its zero value, use var declaration.
Using Test Driven Development for integers
Learn how to do test driven development when using integers from Chris
learn-go-with-tests/integers.md at master · quii/learn-go-with-tests
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Last modified 2yr ago