LEC20081017 - Introduction to Computer Programming October...

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Introduction to Computer Programming October 17, 2008 CSC180 Fall 2008, University of Toronto
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Pointer arithmetic Pointers and arrays are strongly related. When pointers point to an array, we can: 1. Add a pointer and an integer 2. Subtract a pointer and an integer 3. Subtract two pointers 4. Increment and decrement a pointer using ++ and -- , respectively 5. Compare two pointers Example: int a[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; CSC180 Fall 2008, University of Toronto 1
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int x, i; int *pa, *qa; pa = &a[0]; x = *pa; if (*(pa + 1) == a[1]) printf(‘‘*(pa + 1) == a[1]: yes\n’’); i = 5; if (*(pa + i) == a[i]) printf(‘‘*(pa + %d) == a[%d]: yes\n’’, i, i); pa = &a[5]; i = 4; if (*(pa - i) == a[1]) printf(‘‘*(pa %d) == a[1]: yes\n’’, -i); pa = a; if (*pa == a[0]) printf(‘‘*pa == a[0]: yes\n’’); CSC180 Fall 2008, University of Toronto 2
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qa = &a[5]; printf(‘‘qa - pa: %d\n’’, qa - pa); printf(‘‘pa - qa: %d\n’’, pa - qa); printf(‘‘qa > pa: %d\n’’, qa > pa);
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LEC20081017 - Introduction to Computer Programming October...

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