51 lines
837 B
Go
51 lines
837 B
Go
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package main
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import (
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"fmt"
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"os"
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"github.com/inancgumus/learngo/x-tba/foundations/calc/09-packages/calc"
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)
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func main() {
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// lesson: packaging
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// separate dependencies like getting and validating
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// user data as in here.
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//
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// we only put calc to another packages, not the other
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// stuff.
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//
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// so, we can reuse the same calc package and use it
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// over a web api if we want.
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if len(os.Args) != 4 {
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fmt.Println("Usage: calc <number1> <operator> <number2>")
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return
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}
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var (
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a, b float64
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err error
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)
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if a, err = calc.Parse(os.Args[1]); err != nil {
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fmt.Println(err)
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return
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}
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if b, err = calc.Parse(os.Args[3]); err != nil {
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fmt.Println(err)
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return
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}
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op := os.Args[2]
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res, err := calc.Do(a, b, op)
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if err != nil {
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fmt.Println(err)
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return
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}
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fmt.Printf("%v %s %v = %v\n", a, op, b, res)
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}
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