My Problem with VS Code

I tried getting C#/C/Java to work on vs code but whenever I run a Hello World program i get an error message that usually says this:

For C#:

scriptcs : The term 'scriptcs' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path
was included, verify that the path is correct and try again.
At line:1 char:1
+ scriptcs "c:\Users\rverm\Desktop\C++Projects\test\test"
+ ~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (scriptcs:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException


For Java:

javac : The term 'javac' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was
included, verify that the path is correct and try again.
At line:1 char:53
+ cd "c:\Users\rverm\Desktop\CSharpTest\" ; if ($?) { javac HelloWorld. ...
+                                                     ~~~~~
    + CategoryInfo          : ObjectNotFound: (javac:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException