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It's said that when including C header files in C++, the ".h" suffix should be removed and then add "c" at the beginning. For example, #include <cstdio> instead of #include <stdio.h>. But when I use sleep() in my code, #include <cunistd> does not work, but #include <unistd.h> works. Why not <cunistd>?
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In the C and C++ programming languages, unistd. h is the name of the header file that provides access to the POSIX operating system API. It is defined by the POSIX. 1 standard, the base of the Single Unix Specification, and should therefore be available in any POSIX-compliant operating system and compiler.
No, unistd. h and fcntl. h , etc are not part of standard C.
h is a built-in header file in Linux/Unix system, which contains function prototypes of many system call, such as srandom and random function, write function and getpid . The "uni" part in unistd stands for "UNIX", meaning that you won't find it on a Windows system.
The function fork is not a standard Win32 function and I'm not sure if it is available in 3rd party libraries for windows. If you write #include <unistd. h>, you must put that file in "include" folder of visual studio (Installation directory).
Your algorithm is correct for most (all?) standard C headers, but unistd.h is not part of standard C so standard C++ in turn doesn't include it with the other c... headers.
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