go_workshop/chapter_04/exercise_4.20/main.go

package main

import (
  "fmt"
  "math"
)

func convert() string {

  var i8 int8 = math.MaxInt8
  i := 128
  f64 := 3.14
  m := fmt.Sprintf("int8    =  %v -> int64   =  %v\n", i8, int64(i8))
  m += fmt.Sprintf("int     =  %v -> int8    = %v\n", i, int8(i))
  m += fmt.Sprintf("int8    =  %v -> float32 =  %v\n", i8, float64(i8))
  m += fmt.Sprintf("float64 = %v -> int     =    %v\n", f64, int(f64))

  return m

}

func main() {

  fmt.Print(convert())

}