Passing a parameter defined as pointer


I just have problems with the folllowing code

given function X defined as followed:

X(unsigned long * length)


i don't know how to call it ??

i tried :

unsigned long y=20;
unsigned long*z;

it failed... & i am having always an error can't convert from type unsigned long to unsigned long * or vice versa :S:S... anyhelp pleaseeee

urgentlyy needed :(


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