what is a ~ in c++

51 13 c:\users\usuario\documents\destajo 1.cpp [error] 'gotoxy' was not declared in this scope

Parse error: syntax error, unexpected 'prx' (T_STRING) in C:\laragon\www\dashboard_ecom\index.php on line 152

Parse error: syntax error, unexpected 'location' (T_STRING) in C:\xampp\htdocs\loginsystem\login.php on line 23

Undefined index: gross_wt in C:\xampp\htdocs\aezaz\Dev\login\pdf_export\gb1.php on line 34

waiting in a serial as the spool reflect the queue operation. demonstrate printer behavior in context of queue.subject to the scenario implement the pop and push using c++.

symfony check:requirements Fatal error: Using $this when not in object context in C:\Users\Admin\.symfony\cache\check.php on line 778 exit status 255

how to take continuous input in c++ until any value. Like for example(taking input until giving q)

Warning: mysqli_fetch_all() expects parameter 1 to be mysqli_result, bool given in C:\newxammp\htdocs\learn\index.php on line 11

creating default object from empty value in file c:\xampp\htdocs\queuey\app\http\controllers\authcontroller

C program to read name and marks of n number of students and store them in a file.