This lesson's interactive features are locked, please to keep using them
Type Sizes
Integers, uints, floats, and complex numbers all have type sizes.
- Signed integers (no decimal)
int int8 int16 int32 int64
- Unsigned integers (non-negative numbers/no decimal)
uint uint8 uint16 uint32 uint64 uintptr
- Signed decimal numbers
float32 float64
- Complex numbers (a complex number has a real and imaginary part)
complex64 complex128
What's the Deal With the Sizes?
The size (8, 16, 32, 64, 128, etc.) represents how many bits in memory will be used to store the variable. The "default" int and uint types refer to their respective 32 or 64-bit sizes depending on the environment of the user.
The "standard" types that should be used unless you have a specific performance need (e.g. using less memory) are:
intuintfloat64complex128
Converting Between Types
Some types can be easily converted like this:
temperatureFloat := 88.26
temperatureInt := int(temperatureFloat)
Casting a float to an integer in this way truncates the floating point portion.
Assignment
Our Textio customers want to know how long they have had accounts with us.
On line 7, create an accountAgeInt variable and assign it the value of accountAgeFloat truncated to an integer.