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
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