C programming doesn't provide any direct support for the error handling but being a system programming language, it provides you to access at lower level in the form of return values.
However a few methods and variables defined in error.h header file can be used to point out error using the return statement in a function.
Most of the C or even Unix function calls return -1 or NULL in case of any error and sets an error code.
C developers should set errno to 0 at the time of initialization of the program. A value of 0 indicates that there is no error in the program.
C provides the two functions named perror() and strerror(), can be used to display the text message associated with the errno.
The C programming language provides perror() and strerror() functions which can be used to display the text message associated with errno.
perror(): returns the string passed to it along with the textual represention of the current errno value.
The function strerror() returns a pointer to the textual message of the current errno value. The function perror() displays a string you pass to it, followed by a colon and the textual message of the current errno value.
Value of errno: 2 Error printed by perror: No such file or directory Error opening file: No such file or directory
It is a good practice to check divide by zero error. Because sometimes, user might enter a value 0 to the denominator. Here this program illustrates the concept of checking the divide by zero error.
Enter the value of numerator and denominator: 10 5 Value of quotient : 2
Enter the value of numerator and denominator: 10 0 Divide by zero error...!! Press any key to exit...