How To Handle Validation Errors In C?

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    Sometimes your computer may show an error that in c. There can be several reasons for this error to appear. Most C-per-Unix function calls return – or NULL on multiple errors and set the error policy to errno. It is defined as a kind of global variable and indicates any serious error that occurred during the function call. This allows the C programmer to check return values ​​and take appropriate action based on the return value.

    Although there is absolutely no direct support for error (or exception) handling in C, there are methods that can be used to handle errors in C. A programmer takes pride in avoiding extreme errors and returning test function values.
    Many C calls give good results and return -1 or NULL on error. So for case studies with an “if” operator, it’s easy to do a quick check on these restocking fees. For example, in socket programming, the return value of your functions like socket() etc. is listen(). He will probably check for the error no doubt.

    if ((server_fd matches socket (AF_INET, SOCK_STREAM, 0)) == 0) error(“Socket failed”); exit(EXIT_FAILURE);

    1. errno global variable: When the called function is written in C, the variable received as errno is automatically assigned the correct code (value) that can be used to determine the type of error that occurred. This is a global variable,Refers to an error that is displayed on any function call and is specified in the errno.h header file.
      Different requirements (values) for errno mean different error handling methods. The following is a list of some of the different errno values ​​along with their respective values:
      error value error1 /* Operation disabled */2 /* No such file or directory */3 /* No such process */4 /* System call aborted */5 /* I/O error */6 /* No such device location or */7 /* argument list too long */8 /* Runtime type error */9 /* Invalid file size */10 /* No child process */11 /* try regularly */12 /* Out of memory */13 /* Access denied */

      #include

      #include

      int main()

      FILE *fp;

      fp = fopen("GeeksForGeeks.txt" , "r");

      printf("Meaning of all error numbers: %dn" , Error number);

      return 0;

      Output:

      Error number value: 2

      Note. Here the error number is usually set to where 2 means “No such file or directory”. In a network IDE, it can borrow error #13 indicating access denied.

    2. perror() as well as strerror(): the stored value of errno indicates the type of error that occurred.
      If you want to display most of the description of the error, there are two other functions you can use to display a text message. , which may be related to errorno. Operations:
      • perror: Displays the string you entered, followed by a colon, a function space, and a specific textual representation of the current value of errno.
        Syntax:
        void perror (const char *str)str: is the string containing the messagethe habit is often printed just before the subject of the error.
      • strerror(): returns a pointer to a specific textual representation of the current price tag errno.
        Syntax:
        char *strerror(int errnum)errnum: can be called an error number (errno).

      #include

      #include

      #include

      checking error in c

      int main()

      FILE *fp;

      fp=GeeksForGeeks fopen(".txt", "r");

      printf("Error value: %dn " , Error number);

      printf("Error message: %sn" , < /code

      strerror(Error number));

      Is there exception handling in C?

      The C programming language supports less than exception handling or error handling. This is an optional feature offered by C. Despite the significant disadvantage of this feature, there seem to be several ways to implement error handling in C. In general, most processes return either null or -1 on error.

      error("error message");

      return 0;

      Exit:
      To personal desktop:

      Error number value: 2Error message: No such file or directoryError message: No such file or directory

      One of the IDEs for the web:

       Error number value: 13Error content: Access denied

      Note. The perror() function displays the matching string followed by a colon and a text message, usually indicating the current value of the error.

    3. Exit Status: The C standard defines two constants, EXIT_SUCCESS and simply EXIT_FAILURE, that can be passed along with exit() to indicate successth completion and failure, respectively. These are the macros that are passed to stdlib in .h.

      #include

      #include

      #include

      #include

      int main *()

      checking error in c

      File fp;

      fp means fopen ("filedoesnotexist.txt"< code >, "rb");

      Which function checks for a file error?

      The ferror() function checks for errors in the stream. It returns null if no error occurred, and non-zero if there was an error.

      if (fp == NULL)

      What are the error handling techniques in C?

      Adjustable global error. In the English C programming language, this is a variable, then known as an error number, that can be assigned a specific number or policy used in the computer.Smart software to determine the nature of the error.perror() and strerror()exit status.Division by zero error.

      printf("Value for error number: %dn", < /code>Error number);

      printf("Error opening file for: %sn" ,< /code>

      strerror (Error number));

      error("Error typed in error" );< /p>

      exit(EXIT_FAILURE);

      printf("I will definitely printn" );< / code>

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    7. otherwise

      fclose (fp);

      exit(EXIT_SUCCESS);

      printf("I'm not just printedn" );< /code >

      return 0;

      Output:

      value 2error errno: start of file: No such file or directoryError returned by perror: No file or directory type
    8. Division by zero errors. A common mistake C programmers make is not checking before the group operator to see if a given divisor is zero. Division by zero results in undefined behavior, there is no C language construct that can do anything about it. It's best not to literally divide the first digit by zero when checking the denominator.

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