work on powershell $a = Read-Host "enter a number" $b = Read-Host " enter another number " $div = [int]$a / [int]$b if ($div -gt $a) { Write-Output… ...

java.lang.NullPointerException: Cannot invoke method substring() on null object at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:91) at org ...

FullyQualifiedErrorId : InvalidOperationException,Microsoft.PowerShell.Commands.StartProcessCommand Exception calling "Substring" with "2" argument(s): "Length cannot be less than zero. Parameter name ...