How to design a program which determines cyclomatic complexity-advice plz!

Hi there,
I've been asked to design a program to detect the cyclomatic complexity of a module read in from a text file. The program should then display whether or not the module is far too complex or not.
The problem I am having is as follows:
In what way should I test the complexity?
I could count the number of conditional statements and add 1. Possible problems here may be mis-counting(difference between do-while and while).
Any advice would be great,
Thanks in advance
Chris,

The difference between while and Do while is irrelevant. They are both while loops and can be counted by just counting the while part, the do can be ignored.
while (x<y){
xxxxxxxxxxx
do{
xxxxxxxxxxx
}while(x<y)

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