Error:Code:#include <ctime> void sleep(double secs); int main() { sleep(5); return 0; } void sleep(double secs) { using namespace std; clock_t end_time = clock() + clock_t(secs*CLOCKS_PER_SEC); while (clock() < end_time); }Using MSVC++ and winxperror C2871: 'std' : does not exist or is not a namespace
Thanks
VC++ doesnt seem to do what's expected and put the functions and structs in time.h into namespace std.........but as all of the old C headers should be in both global scope and inside the std namespace, you can do without it in this instance if you wish....So drop the using line and it will work
simple
I guess it depends on your compiler as well becuase i tried your original code and it worked fine. I also tried the way i am telling you. They both work no errorsCode:#include <ctime> using namespace std; // move it here void sleep(double secs); int main() { sleep(5); return 0; } void sleep(double secs) { clock_t end_time = clock() + clock_t(secs*CLOCKS_PER_SEC); while (clock() < end_time); }
It was acceptable for face_master to use the "using" statement inside a block and not globally
The problem was with VC++6's <ctime> header
Note that it doesnt mention namespace std...that's whats giving the error - refering to a namespace that hasnt been defined.
#if _MSC_VER > 1000
#pragma once
#endif
#ifndef _CTIME_
#define _CTIME_
#ifdef _STD_USING
#undef _STD_USING
#include <time.h>
#define _STD_USING
#else
#include <time.h>
#endif /* _STD_USING */
#endif /* _CTIME_ */
/*
* Copyright (c) 1994 by P.J. Plauger. ALL RIGHTS RESERVED.
* Consult your license regarding permissions and restrictions.
*/
Also not the date of this header......quite a while before the standard was finished....that's probably the real problem here as I think I read somewhere that namespaces were a late addition to the standard
