In the instructions, they were using Dropbox. I don't have Dropbox, so what should I do?

update: Now I got my way through until the actual check. The 'exist' part is green (yay) but the compile part is red and the printing part is orange. What is the error? Thanks!

  • And shouldn't the 1s be ls in the PS1 document
    – sophiemath
    Dec 28, 2015 at 19:39
  • But when I type in mv source destination, I get "No such file or directory".
    – sophiemath
    Dec 28, 2015 at 19:42
  • never mind, got it now!
    – sophiemath
    Dec 28, 2015 at 20:53

2 Answers 2


that means that your program does not compile successfully. to compile your program, you should navigate to the directory where your source code (.c) file is located using the cd command, then execute the following command:

make <source code file name>

for example, to compile mario.c, you should execute:

make mario

if you don't see any output, that is a great sign! you should find an executable file called mario created in the same directory through which you can run your program.

if you see errors, you need to fix them then retry compiling! see the specs for more info!

you should not try testing your program with check50 before you test your program yourself, maybe by running it, giving it some input and checking if you get the expected output.


Kzidane's contribution is excellent, in fact it helped me a lot too.

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