stdin-stdout-stderr

package main

import (
    "fmt"
)

func main() {
    v1 := "123"
    v2 := 123
    v3 := "Have a nice day\n"
    v4 := "abc"
    fmt.Print(v1, v2, v3, v4)
    fmt.Println()
    fmt.Println(v1, v2, v3, v4)
    fmt.Print(v1, " ", v2, " ", v3, " ", v4, "\n")
    fmt.Printf("%s%d %s %s\n", v1, v2, v3, v4)
}

package main

import (
    "io"
    "os"
)

func main() {
    myString := ""
    arguments := os.Args
    if len(arguments) == 1 {
        myString = "Please give me one argument!"
    } else {
        myString = arguments[1]
    }
    io.WriteString(os.Stdout, "This is Standard output\n")
    io.WriteString(os.Stderr, myString)
    io.WriteString(os.Stderr, "\n")
}

package main

import (
    "bufio"
    "fmt"
    "os"
)

func main() {
    var f *os.File
    f = os.Stdin
    defer f.Close()
    scanner := bufio.NewScanner(f)
    for scanner.Scan() {
        fmt.Println(">", scanner.Text())
    }
}

package main

import (
    "fmt"
    "os"
    "strconv"
)

func main() {
    if len(os.Args) == 1 {
        fmt.Println("Please give one or more floats.")
        os.Exit(1)
    }

    arguments := os.Args
    min, _ := strconv.ParseFloat(arguments[1], 64)
    max, _ := strconv.ParseFloat(arguments[1], 64)
    for i := 2; i < len(arguments); i++ {
        n, _ := strconv.ParseFloat(arguments[i], 64)
        if n < min {
            min = n
        }
        if n > max {
            max = n
        }
    }
    fmt.Println("Min:", min)
    fmt.Println("Max:", max)
}

package main

import (
    "io"
    "os"
)

func main() {
    myString := ""
    arguments := os.Args
    if len(arguments) == 1 {
        myString = "Please give me one argument!"
    } else {
        myString = arguments[1]
    }
    io.WriteString(os.Stdout, myString)
    io.WriteString(os.Stdout, "\n")
}