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From cppreference.com

< c‎ | io

Compiler support
Language
Headers
Type support
Program utilities
Variadic function support
Error handling
Dynamic memory management
Strings library
Algorithms
Numerics
Date and time utilities
Input/output support
Localization support
Concurrency support (C11)
Technical Specifications
Symbol index

File input/output

Types and objects

stdinstdoutstderr

FILE
fpos_t

Functions

File access

fopenfopen_s (C11)
freopenfreopen_s (C11)
fwide (C95)

setbuf
setvbuf
fclose
fflush

Unformatted input/output

fgetc
fgets
fputc
fputs
getchar
getsgets_s (until C11)(C11)
putchar
puts
ungetc

fgetwcgetwc (C95)(C95)
fgetws (C95)
fputwcputwc (C95)(C95)
fputws (C95)
getwchar (C95)
putwchar (C95)
ungetwc (C95)

Formatted input

scanffscanfsscanfscanf_sfscanf_ssscanf_s (C11)(C11)(C11)
wscanffwscanfswscanfwscanf_sfwscanf_sswscanf_s (C95)(C95)(C95)(C11)(C11)(C11)

vscanfvfscanfvsscanfvscanf_svfscanf_svsscanf_s (C99)(C99)(C99)(C11)(C11)(C11)
vwscanfvfwscanfvswscanfvwscanf_svfwscanf_svswscanf_s (C99)(C99)(C99)(C11)(C11)(C11)

Direct input/output

Formatted output

printffprintfsprintfsnprintfprintf_sfprintf_ssprintf_ssnprintf_s (C99)(C11)(C11)(C11)(C11)
wprintffwprintfswprintfwprintf_sfwprintf_sswprintf_ssnwprintf_s (C95)(C95)(C95)(C11)(C11)(C11)(C11)

vprintfvfprintfvsprintfvsnprintfvprintf_svfprintf_svsprintf_svsnprintf_s (C99)(C11)(C11)(C11)(C11)
vwprintfvfwprintfvswprintfvwprintf_svfwprintf_svswprintf_svsnwprintf_s (C95)(C95)(C95)(C11)(C11)(C11)(C11)

File positioning

ftell
fgetpos
fseek

fsetpos
rewind

Error handling

clearerr
feof

ferror
perror

Operations on files

remove
tmpfiletmpfile_s (C11)