第一章代碼調試

目錄結構：

calc.go

package main

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

var Usage = func() {
    fmt.Println("USAGE: calc command ....")
    fmt.Println("\n The commands are")
}

func main() {
    args := os.Args
    if args == nil || len(args) < 2 {
        Usage()
        return
    }

    switch args[1] {
    case "add":
        // if len(args) != 3 {
        //  fmt.Println("add")
        //  return
        // }
        v1, err1 := strconv.Atoi(args[2])
        v2, err2 := strconv.Atoi(args[3])
        if err1 != nil || err2 != nil {
            fmt.Println("ADDQ")
            return
        }
        ret := simplemath.Add(v1, v2)
        fmt.Println("Result:", ret)
    default:
        //fmt.Println(args[1])
    }
}

add.go

package simplemath

func Add(a int, b int) int {
    return a + b
}

add_test.go

package simplemath

import "testing"

func TestAdd1(t *testing.T) {
    r := Add(1, 2)
    if r != 3 {
        t.Errorf("Add(1, 2) failed. Got %d, expected 3.", r)
    }
}