Powershell 计算器脚本无法正常工作

Question

我创建了一个非常简单的 powershell 脚本来计算表达式。即：

$expression = read-host -prompt "Enter an expression"
$result = $expression
write-host "The result is $result"
read-host

然而，当我这样使用它时：

Enter an expression: 2+3

The result is 2+3

如何让第2行计算出结果？

Answer 1

也许这对你有帮助：

 $expression = read-host -prompt "Enter an expression"

# check for dangerous code
if( ($expression -replace '^[0-9\+\-\*\/ ]+$').Length -eq 0 ) {
    try {
        $result = Invoke-Expression $expression
        write-host "The result is $result"
    }
    catch {
        write-host "Syntax error"
    }
}
else {
    write-host "Invalid expression"
}

Powershell 计算器脚本无法正常工作

Powershell calculator script is not working properly

variables

powershell

calculation