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Error Handling in C
Error handling is not supported by C language. There are some other ways by which error handling can be done in C language. The header file “error.h” is used to print the errors using return statement function.
It returns -1 or NULL in case of any error and errno variable is set with the error code. Whenever a function is called in C language, errno variable is associated with it. errno is a global variable and is used to find the type of error in the execution.
The following table displays some errors −
| Sr.No | Errors & Error value |
|---|---|
| 1 | I/O Error 5 |
| 2 | No such file or directory 2 |
| 3 | Argument list too long 7 |
| 4 | Out of memory 12 |
| 5 | Permission denied 13 |
There are some methods to handle errors in C language −
perror() − This function is used to print the error and it returns the string along with the textual representation of current errno value.
strerror() − This function is declared in “string.h” header file and it returns the pointer to the string of current errno value.
Exit status − There are two constants EXIT_SUCCESS and EXIT_FAILURE which can be used in function exit() to inform the calling function about the error.
Divided by zero − This is a situation in which nothing can be done to handle this error in C language. Avoid this error and you can check the divisor value by using ‘if’ condition in the program.
Here is an example of error handling in C language,
Example
#include <stdio.h>
#include <stdlib.h>
main() {
int x = 28;
int y = 8;
int z;
if( y == 0) {
fprintf(stderr, "Division by zero!\n");
exit(EXIT_FAILURE);
}
z = x / y;
fprintf(stderr, "Value of z : %d\n", z );
exit(EXIT_SUCCESS);
}Output
Here is the output
Value of z : 3
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