Fopen c rb. h> FILE *fopen(const char *restrict pathname, const char *restrict mode); FILE *fdopen(int fd, const char *mode); FILE *freopen(const char *restrict pathname, const char *restrict mode, FILE *restrict stream); Feature Test Sep 10, 2023 · C-style I/O Types and objects FILE fpos_t stdinstdoutstderr Functions 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 The fopen () function shall open the file whose pathname is the string pointed to by pathname, and associates a stream with it. Jul 12, 2025 · In C, the fopen () function is used to open a file in the specified mode. r or rb Open file for reading. The fopen () function opens the file specified by filename and associates a stream with it. The mode argument points to a string. The function returns a file pointer (FILE *) which is used to perform further operations on the file, such as reading from or writing to it. fopen(3) Library Functions Manual fopen(3) NAME top fopen, fdopen, freopen - stream open functions LIBRARY top Standard C library (libc, -lc) SYNOPSIS top #include <stdio. It opens a file and returns a pointer to a FILE object that can be used to access the file. If the string is one of the following, the file shall be opened in the indicated mode. If the file exists then the fopen () function opens the particular file else a new file is created in some cases. The mode variable is a character string specifying the type of access requested for the file. Otherwise, the behavior is undefined. . a or ab Append The C library function FILE *fopen (const char *filename, const char *mode) opens the filename pointed to, by filename using the given mode. w or wb Truncate to zero length or create file for writing. luykiv osn mljx bkd lamolgln ifuu sbknet hkrg qxvjt tjofzenz