31 lines
492 B
Go
31 lines
492 B
Go
package main
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import (
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"fmt"
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"os"
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"strconv"
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)
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func main() {
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// lesson: error handling + short decl. assignment
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if len(os.Args) != 3 {
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fmt.Println("Usage: calc <number1> <number2>")
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return
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}
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a, err := strconv.ParseFloat(os.Args[1], 64)
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if err != nil {
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fmt.Println("Please provide a valid number")
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return
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}
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b, err := strconv.ParseFloat(os.Args[2], 64)
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if err != nil {
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fmt.Println("Please provide a valid number")
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return
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}
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fmt.Printf("%v + %v = %v\n", a, b, a+b)
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}
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