Numerical Types

Go has most of the well-known types such as int. The int type has theappropriate length for your machine, meaning that on a 32-bit machine it is 32bits and on a 64-bit machine it is 64 bits. Note: an int is either 32 or 64bits, no other values are defined. Same goes for uint, the unsigned int.

If you want to be explicit about the length, you can have that too, withint32, or uint32. The full list for (signed and unsigned) integers isint8, int16, int32, int64 and byte, uint8, uint16, uint32,uint64, with byte being an alias for uint8. For floating point valuesthere is float32 and float64 (there is no float type). A 64 bit integer orfloating point value is always 64 bit, also on 32 bit architectures.

Note that these types are all distinct and assigning variables which mix thesetypes is a compiler error, like in the following code:

package main
func main() {
    var a int
    var b int32
    b = a + a
    b = b + 5
}

We declare two different integers, a and b where a is an int and b is anint32. We want to set b to the sum of a and a. This fails and gives the error:cannot use a + a (type int) as type int32 in assignment. Adding the constant5 to b does succeed, because constants are not typed.