mirror of
https://github.com/unknwon/the-way-to-go_ZH_CN.git
synced 2025-08-11 19:41:43 +08:00
56 lines
1.3 KiB
Go
Executable File
56 lines
1.3 KiB
Go
Executable File
// calculator.go
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// example: calculate 3 + 4 = 7 as input: 3 ENTER 4 ENTER + ENTER --> result = 7,
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package main
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import (
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"./stack/stack"
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"bufio"
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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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buf := bufio.NewReader(os.Stdin)
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calc1 := new(stack.Stack)
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fmt.Println("Give a number, an operator (+, -, *, /), or q to stop:")
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for {
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token, err := buf.ReadString('\n')
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if err != nil {
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fmt.Println("Input error !")
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os.Exit(1)
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}
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token = token[0 : len(token)-2] // remove "\r\n"
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// fmt.Printf("--%s--\n",token) // debug statement
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switch {
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case token == "q": // stop als invoer = "q"
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fmt.Println("Calculator stopped")
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return
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case token >= "0" && token <= "999999":
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i, _ := strconv.Atoi(token)
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calc1.Push(i)
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case token == "+":
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q, _ := calc1.Pop()
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p, _ := calc1.Pop()
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fmt.Printf("The result of %d %s %d = %d\n", p, token, q, p.(int)+q.(int))
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case token == "-":
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q, _ := calc1.Pop()
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p, _ := calc1.Pop()
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fmt.Printf("The result of %d %s %d = %d\n", p, token, q, p.(int)-q.(int))
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case token == "*":
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q, _ := calc1.Pop()
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p, _ := calc1.Pop()
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fmt.Printf("The result of %d %s %d = %d\n", p, token, q, p.(int)*q.(int))
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case token == "/":
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q, _ := calc1.Pop()
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p, _ := calc1.Pop()
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fmt.Printf("The result of %d %s %d = %d\n", p, token, q, p.(int)/q.(int))
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default:
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fmt.Println("No valid input")
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}
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}
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}
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