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78 lines
1.2 KiB
78 lines
1.2 KiB
5 years ago
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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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func isOp(s string) bool {
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return s == "+" ||
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s == "-" ||
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s == "*" ||
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s == "/" ||
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s == "%"
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}
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func deleteExtraSpaces(arr []string) []string {
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var res []string
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for _, v := range arr {
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if v != "" {
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res = append(res, v)
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}
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}
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return res
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}
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func main() {
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if len(os.Args) == 2 {
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var values []int
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var n int
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op := strings.Split(os.Args[1], " ")
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op = deleteExtraSpaces(op)
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for _, v := range op {
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val, err := strconv.Atoi(v)
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if err == nil {
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values = append(values, val)
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continue
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}
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n = len(values)
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if isOp(v) && n < 2 {
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fmt.Println("Error")
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os.Exit(0)
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}
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switch v {
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case "+":
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values[n-2] += values[n-1]
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values = values[:n-1]
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case "-":
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values[n-2] -= values[n-1]
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values = values[:n-1]
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case "*":
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values[n-2] *= values[n-1]
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values = values[:n-1]
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case "/":
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values[n-2] /= values[n-1]
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values = values[:n-1]
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case "%":
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values[n-2] %= values[n-1]
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values = values[:n-1]
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default:
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fmt.Println("Error")
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os.Exit(0)
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}
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}
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if len(values) == 1 {
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fmt.Println(values[0])
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} else {
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fmt.Println("Error")
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}
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} else {
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fmt.Println("Error")
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}
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}
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