Duplication/Redundancy

For objects or variables , when you assign them to another variable or pass them to a function for example, object content or variable content will be copied to a whole new place in memory and assigned to a the new variable, that what causes duplication. consider this simple example:

int x = 100; if you pass x to a function like this: [self aFunction:x]

-(void) aFunction:(int)param { // do something with param } This will result that the value of x is copied to a new place in memory and assigned to variable "param" inside the function.

However when use a pointer, you make sure you only pass the address of the memory location where the object or variable sets, so no other copy of the object is created. int x = 100; int *xp = &x; //to store the memory address of x in a pointer called xp [self aFunction:x]

-(void) aFunction:(int*)param {... } // in this case param is actually holding a memory address that points to where x is stored.

Ohkey... Quite clear now... Thnx Safwat:-)