86 lines
1.3 KiB
Go
86 lines
1.3 KiB
Go
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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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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"strconv"
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"strings"
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)
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const (
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validOps = "%*/+-"
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usageMsg = "Usage: [op=" + validOps + "] [size]"
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sizeMissingMsg = "Size is missing"
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invalidOpMsg = `Invalid operator.
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Valid ops one of: ` + validOps
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invalidOp = -1
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)
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func main() {
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args := os.Args[1:]
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switch l := len(args); {
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case l == 1:
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fmt.Println(sizeMissingMsg)
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fallthrough
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case l < 1:
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fmt.Println(usageMsg)
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return
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}
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op := args[0]
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if strings.IndexAny(op, validOps) == invalidOp {
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fmt.Println(invalidOpMsg)
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return
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}
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size, err := strconv.Atoi(args[1])
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if err != nil || size <= 0 {
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fmt.Println("Wrong size")
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return
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}
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fmt.Printf("%5s", op)
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for i := 0; i <= size; i++ {
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fmt.Printf("%5d", i)
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}
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fmt.Println()
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for i := 0; i <= size; i++ {
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fmt.Printf("%5d", i)
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for j := 0; j <= size; j++ {
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var res int
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switch op {
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case "*":
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res = i * j
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case "%":
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if j != 0 {
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res = i % j
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}
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case "/":
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if j != 0 {
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res = i / j
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}
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case "+":
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res = i + j
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case "-":
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res = i - j
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}
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fmt.Printf("%5d", res)
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}
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fmt.Println()
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}
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}
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