I made a file called hello.c and typed in the code exactly as required for pset1 but when I type in make hello in the terminal I receive the following text:

clang -fsanitize=integer -fsanitize=undefined -ggdb3 -O0 -std=c11 -Wall -Werror -Wextra -Wno-sign-compare -Wshadow hello.c -lcrypt -lcs50 -lm -o hello

I've tried looking for what this error means online but haven't been able to find anything that quite matches this. I made sure that I saved the file and it's located in pset1. Any advice?

2 Answers 2


That seems like it's running correctly? have you made sure to run update50 (or is it updatecs50?)

check and see if you have a file just called "hello" in your pset1 directory.

  • Thank-you, you were right it runs correctly. I just didn't expect a message like that to pop up so I assumed it wasn't working.
    – Gort
    Mar 11, 2017 at 9:22
  • I wish I had that error message :)
    – Lisa Frank
    Jul 28, 2017 at 0:50

Now try ./hello

This is a normal message.

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