LEC20081009 - Introduction to Computer Programming October...

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Unformatted text preview: Introduction to Computer Programming October 9, 2008 CSC180 Fall 2008, University of Toronto Pointer variables • Two things to remember about a pointer variable: 1. A pointer variable, like non-pointer variables, is put in memory at an address. 2. A pointer variable’s value is an address. • Example: int i, *p; /* both i and p are put in memory */ p = &i; /* assign i’s address to p */ CSC180 Fall 2008, University of Toronto 1 0xbff2cebc | p = 0xbff2cec0 | (p occupies 4 bytes) 0xbff2cebd | | 0xbff2cebe | | 0xbff2cebf | | 0xbff2cec0 | i | (i occupies 4 bytes) 0xbff2cec1 | | 0xbff2cec2 | | 0xbff2cec3 | | • p ’s address is 0xbff2cebc , and i ’s address is 0xbff2cec0 . p contains the address of i , 0xbff2cec0 . • Since p contains the address of i , we can simplify the above picture: _ _ |p|--->|i|-- CSC180 Fall 2008, University of Toronto 2 • Each box above represents an object in memory. The arrow shows that p points to i , i.e., p contains the address of i . *p gets the object pointed to by p , which is i ....
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This note was uploaded on 01/10/2011 for the course CSC 180 taught by Professor Na during the Fall '01 term at University of Toronto.

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LEC20081009 - Introduction to Computer Programming October...

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