I am passing the edX CS50 2019 course. I have a problem with making my first hello program.

The system for some reasons doesn't see the library, so I cannot use the GetString function.

Here is the screenshot: enter image description here

Hope someone knows the root of the problem

Regards, M.Kayama

2 Answers 2


Per the error message: did you mean get_string?

There is no GetString in the CS50 library any more; it was changed a few years ago to get_string. Try that.

  • What a shame. It worked. Thank you for help and sorry for silly question.
    – M.Kayama
    Mar 12, 2019 at 4:18

further more the hello world example is to illustrate the printf function and as advancing into the course the get_string illustrates the string function, so its possible you are thinking/mixing hello.c program vs string.c screen shotenter image description here

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