Golang : Convert(cast) int to float example

Problem :

You have a variable of type int and you want to convert/type cast it to float64 type. Also, you want to use reflect to confirm the variable type after conversion.

Solution :

Type cast the integer variable with float32(single precision floating point) or float64 and use reflect.TypeOf() function to confirm.

For example :

 package main

 import (

 func main() {
  var intValue int = 1088

  var floatValue float64 = float64(intValue)

  fmt.Printf("The type of intValue is %v \n", reflect.TypeOf(intValue))

  fmt.Printf("The type of floatValue is %v \n", reflect.TypeOf(floatValue))

Output :


The type of intValue is int


The type of floatValue is float64

References :


From https://golang.org/ref/spec#Types :

 uint8 the set of all unsigned  8-bit integers (0 to 255)
 uint16 the set of all unsigned 16-bit integers (0 to 65535)
 uint32 the set of all unsigned 32-bit integers (0 to 4294967295)
 uint64 the set of all unsigned 64-bit integers (0 to 18446744073709551615)

 int8 the set of all signed  8-bit integers (-128 to 127)
 int16 the set of all signed 16-bit integers (-32768 to 32767)
 int32 the set of all signed 32-bit integers (-2147483648 to 2147483647)
 int64 the set of all signed 64-bit integers (-9223372036854775808 to 9223372036854775807)

 float32 the set of all IEEE-754 32-bit floating-point numbers
 float64 the set of all IEEE-754 64-bit floating-point numbers

 complex64 the set of all complex numbers with float32 real and imaginary parts
 complex128  the set of all complex numbers with float64 real and imaginary parts

 byte alias for uint8
 rune alias for int32

  See also : Golang : Convert(cast) float to int

By Adam Ng

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