How do you handle error in C language ?

  In C programming, error handling can be done using various techniques. Here are some common methods for handling errors in C:

• Return values: Functions can return values that indicate whether they executed successfully or encountered an error. For example, a function that reads a file might return a value of 0 if it was successful or -1 if it encountered an error.
• Global variables: Global variables can be used to keep track of errors that occur during program execution. For example, you might define a global variable "errno" that stores an error code when a function fails.
• Assertions: Assertions are statements that check if a certain condition is true, and if not, they terminate the program. For example, you might use an assertion to check if a pointer is null before dereferencing it.
• Exception handling: Although C does not have built-in support for exception handling, some C compilers provide extensions that allow you to use try-catch blocks like in other languages such as C++.
• Signal handling: C programs can handle signals, which are software interrupts that are raised by the operating system. For example, a program might handle the SIGTERM signal to gracefully shut down when it receives a termination signal.
• Regardless of the method used, error handling in C should always include clear and informative error messages that provide users with enough information to understand and potentially fix the issue.