No, he means another thread. C++ currently doesn't come with a platform independent way to spawn threads, so you'll have to either rely on Operating System API calls, or use a library (I recommend Boost).
There are plenty of examples of both ways and I suggest reading some tutorials on multi-threading w/ C++ first.
Also, may I ask why you want to do this in the first place?
If it's for measuring the time the users takes to produce some input it's much easier to check the time before you ask for input, check it again right after input has been received and simply subtract the two.
The ctime library only supports a granularity down to seconds. For milliseconds you must either use a non-portable library (such as GetTickCount()). The Boost Date_Time library offers sub-second resolution if the underlying platform does as well (which Windows does).
Standard solutions include dividing the result by CLOCKS_PER_SEC (be sure to cast either of the operands to double) and hoping for the best, or taking advantage of the new <chrono> stuff in C++0x. Both are non-portable at this time. The former is unconditionally non-portable and the latter depends on adoption of the upcoming standard in compilers.
I have a 2d matrix with dimension (3, n) called A, I want to calculate the normalization and cross product of two arrays (b,z) (see the code please) for each column (for the first column, then the second one and so on).
the function that I created to find the ...
Write a C program that should create a 10 element array of random integers (0 to 9). The program should total all of the numbers in the odd positions of the array and compare them with the total of the numbers in the even positions of the array and indicate ...