conduct your cpu time

a simple program to conduct your cpu time curve

This is a popular problem in MSRA interview.
interviewer:
How do you know about the operation system?
interviewee:
Very!......
interviewer:
Well, can you make the cpu time curve act as a straight line?
can you make it act as a sin curve?
interviewee:
.....
Example:
%complie:
mex cConductCpuTime.cpp
%
conductCpuTime(200, 300, 5);
Then press Ctrl+Alt+Delete to check the cpu time Curve