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# ferror

From cppreference.com
< c‎ | io

Defined in header `<stdio.h>` |  |
int ferror( FILE *stream ); |  |

Checks the given stream for errors.

### [edit] Parameters

stream | - | the file stream to check

### [edit] Return value

nonzero value if the file stream has errors occurred, ​0​ otherwise

### [edit] Example

ferror used in error checking

Run this code

    #include <stdio.h>
    #include <stdlib.h>

    int main(void)
    {
        FILE* tmpf = tmpfile();
        fputs("abcde\n", tmpf);
        rewind(tmpf);

        int ch;
        while ((ch=fgetc(tmpf)) != EOF)   /* read/print characters including newline */
              printf("%c", ch);

        /* Test reason for reaching EOF. */
        if (feof(tmpf))          /* if failure caused by end-of-file condition */
           puts("End of file reached successfully");
        else if (ferror(tmpf))   /* if failure caused by some other error      */
             {
                perror("fgetc()");
                fprintf(stderr,"fgetc() failed in file %s at line # %d\n", __FILE__,__LINE__-9);
                exit(EXIT_FAILURE);
             }

        return EXIT_SUCCESS;
    }

Output:

    abcde
    End of file reached successfully

### [edit] See also

clearerr | clears errors (function) [edit]
feof | checks for the end-of-file (function) [edit]
perror | displays a character string corresponding of the current error to stderr (function) [edit]
C++ documentation for ferror

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