Section on sleep Functions

Today, a student asked me about the sleep function. I remember it was defined in DOS. h. When the sleep () function is used in vc6 and vc2008, the following error occurs: 'Sleep 'undefined.

Later, I checked to find out why VC's support for the C standard is not perfect.

In 'dos. H', _ sleep () should be used. A warning will be given during compilation. Just ignore it.

In 'windows. H', you should use sleep ()

On the Linux platform, there is no problem in using sleep. It seems that the details cannot be ignored.