What header file is stdio.h?

Generally, in C language or C, the extension name of the file used to #include is .h, which is called header file. The purpose of the #include file is to put content common to multiple compilation units (that is, c or cpp files) into a separate file to reduce the overall code size; or to provide cross-project common code.

In the current c version, the application of this header file should be #include<stdio.h>

##stdio refers to "standard input & output" (standard input and output)

Reference method

#include <stdio.h>

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