Web Reference: The C library fprintf () function is used to write formatted data to a stream. It is part of the standard I/O library and allows you to write data to a file stream as opposed to printf () which writes to the standard output stream. The fprintf() function writes a formatted string into a file. The fprintf() function is defined in the header file. The format string can contain format specifiers which describe where and how to represent additional arguments that are passed into the function. May 23, 2024 · As with all bounds-checked functions, printf_s, fprintf_s, sprintf_s, and snprintf_s are only guaranteed to be available if __STDC_LIB_EXT1__ is defined by the implementation and if the user defines __STDC_WANT_LIB_EXT1__ to the integer constant 1 before including .
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