how to format a .txt file in working directory so it can be opened and read on Mac in CLion C executable

Hello! CLion looks for input files and writes output files to the "generation path" folder (cmake-build-debug by default, can be set in File | Settings | Build, Execution, Deployment | CMake | Generation path). If you put your input file in this folder, CLion will be able to open it. Or you can just try setting an explicit path like C:/<path_to_file>/data.txt in input_file.open().

@Anna Falevskaya its very strange CLion can see the file and opens the file but then the program crashes straight away leaving an error code 6 can any one send screen shots of a simple code in c and the file formatting that opens a file because I  think iv tried everything.

See, for example, this article - https://www.programiz.com/c-programming/c-file-input-output.

Learn python basics Python Tutorial http://”https://www.theversetech.com/2020/02/python.html/” 

I am using Linux, not Mac. When I use FILE *fp=fopen("filename.txt",w); it works but I do not know where it is (as the following field (Generation path) does not exist: File | Settings | Build, Execution, Deployment | CMake | Generation path). When I use FILE *fp=fopen("/home-directory/filename.txt",w); (home-directory is any directory which I created after my home), the open file fails (return null).

>as the following field (Generation path) does not exist: File | Settings | Build, Execution, Deployment | CMake | Generation path

It's now called "Build directory".

After using Build Directory to select a directory which I created, /project-directory/debug (thanks for the tip), and executing FILE *fp=fopen("filename.txt",w); ...; fprintf(fp, "%f ", src_rotation[i]); fclose(fp); the directory .../debug is still empty. Again why FILE *fp=fopen("/project-directory/filename.txt",w); should fail?  

Hi William!

Sorry for the delay. Did you run your project? The file should be created next to the executable, in the Build Directory.