Go language type conversion

Go language type conversion

Type conversion is used to convert a variable of one data type to another type of variable. The basic format for Go language type conversion is as follows:

type_name(expression)

type_name is a type and expression is an expression.

Instance

In the following example, the integer is converted to a floating-point type and the result is calculated to assign the result to the floating-point variable:

package main

import "fmt"

func main() {
   var sum int = 17
   var count int = 5
   var mean float32
   
   mean = float32(sum)/float32(count)
   fmt.Printf("mean 的值为: %f\n",mean)
}

The output of the above examples is:

mean 的值为: 3.400000

go does not support implicit conversion types

Example:

package main
import "fmt"

func main() {  
    var a int64 = 3
    var b int32
    b = a
    fmt.Printf("b 为 : %d", b)
}

An error will be reported at this point

cannot use a (type int64) as type int32 in assignment
cannot use b (type int32) as type string in argument to fmt.Printf

But if you change b = int32(a) make a mistake:

package main
import "fmt"

func main() {  
    var a int64 = 3
    var b int32
    b = int32(a)
    fmt.Printf("b 为 : %d", b)
}