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ungetc
From cppreference.com
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C
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
[edit]
File input/output
Types and objects
stdin
stdout
stderr
FILE
fpos_t
Functions
File access
fopen
fopen_s
(C11)
freopen
freopen_s
(C11)
fwide
(C95)
setbuf
setvbuf
fclose