std::fgetc, std::getc

 

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File access fopen freopen fclose fflush fwide setbuf setvbuf Direct input/output fread fwrite Unformatted input/output fgetcgetc fgets fputcputc fputs getchar gets (until C++14) putchar puts ungetc fgetwcgetwc fgetws fputwcputwc fputws getwchar putwchar ungetwc Formatted input scanffscanfsscanf vscanfvfscanfvsscanf (C++11)(C++11)(C++11)     wscanffwscanfswscanf vwscanfvfwscanfvswscanf (C++11)(C++11)(C++11)	Formatted output printffprintfsprintfsnprintf (C++11) vprintfvfprintfvsprintfvsnprintf (C++11)     wprintffwprintfswprintf vwprintfvfwprintfvswprintf File positioning ftell fgetpos fseek fsetpos rewind Error handling clearerr feof ferror perror Operations on files remove rename tmpfile tmpnam

 

Defined in header <cstdio>
int fgetc( std::FILE* stream ); int getc( std::FILE* stream );

Reads the next character from the given input stream.

Parameters

stream

-

to read the character from

Return value

The obtained character on success or EOF on failure.

If the failure has been caused by end of file condition, additionally sets the eof indicator (see std::feof()) on stream. If the failure has been caused by some other error, sets the error indicator (see std::ferror()) on stream.

Example

Run this code

#include <cstdio>
#include <cstdlib>
 
int main()
{
    int is_ok = EXIT_FAILURE;
    FILE* fp = std::fopen("/tmp/test.txt", "w+");
    if(!fp) {
        std::perror("File opening failed");
        return is_ok;
    }
 
    int c; // note: int, not char, required to handle EOF
    while ((c = std::fgetc(fp)) != EOF) { // standard C I/O file reading loop
       std::putchar(c);
    }
 
    if (std::ferror(fp)) {
        std::puts("I/O error when reading");
    } else if (std::feof(fp)) {
        std::puts("End of file reached successfully");
        is_ok = EXIT_SUCCESS;
    }
 
    std::fclose(fp);
    return is_ok;
}

Output:

End of file reached successfully

See also

gets (deprecated in C++11)(removed in C++14)	reads a character string from stdin (function)
fputcputc	writes a character to a file stream (function)
ungetc	puts a character back into a file stream (function)
C documentation for fgetc, getc