Ankit Kumar Saxena

How much I should charge for 10th to 12th level student and for C language for B.tech student for Bangalore....

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You need to understand that the header file dos.h was created to facilitate calls to System API and the OS, so that programmers could use system calls such as delay (int) or sleep (int) in their programs. But it was written at a time when DOS was the primary and Microsoft's only operating system! Unlike in the late 90s when it served as the shell on top of which early versions of Windows ran. But now, OSs like Windows Vista, 7, 8, 10 etc. are pure 32/64 bit systems and CMD is just an interaction utility that's provided to the user so that they can work on Command Line! Now you've got to realize that when Dev C++ was being developed, DOS was perishing and system calls could only be made on the OS on which the compiler is running, right? And that's when the header file windows.h was written to aid windows users and unix.h for unix users and so on. So, now there are two things you can do: You can copy the header file dos.h from an older compiler like TCC or your Turbo C++'s Lib to the Cygwin library that, I think Dev C++ uses. Although it may not work (compatibility/Security issues that modern compilers have); or Check the online documentation for windows.h and find the equivalent functions, and use them in your program, good luck