How to drop a table if it exists?

Is it correct to do the following? No. That will drop the table only if it contains any rows (and will raise an error if the table does not exist). Instead, for a permanent table you can use Or, for a temporary table you can use SQL Server 2016+ has a better way, using DROP TABLE IF … Read more

How to execute a program or call a system command?

Use the subprocess module in the standard library: The advantage of subprocess.run over os.system is that it is more flexible (you can get the stdout, stderr, the “real” status code, better error handling, etc…). Even the documentation for os.system recommends using subprocess instead: The subprocess module provides more powerful facilities for spawning new processes and retrieving their results; using that module is preferable to using this function. See the Replacing Older Functions with … Read more

How to convert an int to string in C?

EDIT: As pointed out in the comment, itoa() is not a standard, so better use sprintf() approach suggested in the rivaling answer! You can use itoa() function to convert your integer value to a string. Here is an example: If you want to output your structure into a file there is no need to convert any value beforehand. You can just use … Read more

What does “collect2: error: ld returned 1 exit status” mean?

The ld returned 1 exit status error is the consequence of previous errors. In your example there is an earlier error – undefined reference to ‘clrscr’ – and this is the real one. The exit status error just signals that the linking step in the build process encountered some errors. Normally exit status 0 means success, and exit status > 0 means errors. … Read more

GitHub Error Message – Permission denied (publickey)

GitHub isn’t able to authenticate you. So, either you aren’t setup with an SSH key, because you haven’t set one up on your machine, or your key isn’t associated with your GitHub account. You can also use the HTTPS URL instead of the SSH/git URL to avoid having to deal with SSH keys. This is GitHub’s recommended … Read more