Golang Type Conversion

type_conversion.go

// Playbook: http://play.golang.org/p/kp5uL_mMGk
// Note: Type assertion like "someVariable.(string)" is useful when you are dealing with interface{} (empty interface)

package main

import (
    "fmt"
    "strconv"
)

func main() {
    fmt.Println("Float32ToString:", Float32ToString(float32(55.55)))
    fmt.Println("Float64ToString:", Float64ToString(float64(55.55)))

    fmt.Println("Int32ToString:", Int32ToString(int32(-44)))
    fmt.Println("Int64ToString:", Int64ToString(int64(-44)))

    fmt.Println("Uint32ToString:", Uint32ToString(uint32(44)))
    fmt.Println("Uint64ToString:", Uint64ToString(uint64(44)))

    string1, _ := strconv.Atoi("66")
    fmt.Println("StringToInt with strconv.Atoi:", string1)
    fmt.Println("IntToString with strconv.Itoa (Actually it is int64):", strconv.Itoa(11))
    fmt.Println("BoolToString:", BoolToString(true))

    float1, _ := StringToFloat32("22.22")
    float2, _ := StringToFloat64("22.22")
    fmt.Println("StringToFloat32:", float1)
    fmt.Println("StringToFloat64:", float2)

    int1, _ := StringToInt32("-33")
    int2, _ := StringToInt64("-33")
    fmt.Println("StringToInt32:", int1)
    fmt.Println("StringToInt64:", int2)

    uint1, _ := StringToUint32("33")
    uint2, _ := StringToUint64("33")
    fmt.Println("StringToUint32:", uint1)
    fmt.Println("StringToUint64:", uint2)
}

func Float32ToString(value float32) string {
    return Float64ToString(float64(value))
}

func Float64ToString(value float64) string {
    return strconv.FormatFloat(value, 'f', -1, 64)
}

func Int32ToString(value int32) string {
    return Int64ToString(int64(value))
}

func Int64ToString(value int64) string {
    return strconv.FormatInt(value, 10)
}

func Uint32ToString(value uint32) string {
    return Uint64ToString(uint64(value))
}

func Uint64ToString(value uint64) string {
    return strconv.FormatUint(value, 10)
}

func BoolToString(value bool) string {
    return strconv.FormatBool(value)
}

func StringToFloat32(value string) (float32, error) {
    result, err := StringToFloat64(value)
    if err != nil {
        return 0, err
    }
    return float32(result), nil
}

func StringToFloat64(value string) (float64, error) {
    result, err := strconv.ParseFloat(value, 64)
    if err != nil {
        return 0, err
    }
    return result, nil
}

func StringToInt32(value string) (int32, error) {
    result, err := StringToInt64(value)
    if err != nil {
        return 0, err
    }
    return int32(result), nil
}

func StringToInt64(value string) (int64, error) {
    result, err := strconv.ParseInt(value, 10, 64)
    if err != nil {
        return 0, err
    }
    return result, nil
}

func StringToUint32(value string) (uint32, error) {
    result, err := StringToUint64(value)
    if err != nil {
        return 0, err
    }
    return uint32(result), nil
}

func StringToUint64(value string) (uint64, error) {
    result, err := strconv.ParseUint(value, 10, 64)
    if err != nil {
        return 0, err
    }
    return result, nil
}

// Float32ToString: 55.54999923706055
// Float64ToString: 55.55
// Int32ToString: -44
// Int64ToString: -44
// Uint32ToString: 44
// Uint64ToString: 44
// StringToInt with strconv.Atoi: 66
// IntToString with strconv.Itoa (Actually it is int64): 11
// BoolToString: true
// StringToFloat32: 22.22
// StringToFloat64: 22.22
// StringToInt32: -33
// StringToInt64: -33
// StringToUint32: 33
// StringToUint64: 33