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l12_6up - MyString contd CSci 1113 C/C for Scientists and...

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: CSci 1113 C/C++ for Scientists and Engineers Section 010 - evening class Pointers, Dynamic Arrays, Linked Lists Prof. Eric Van Wyk and Ted Kaminski Spring 2010 c Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 1 / 27 MyString, cont’d : Recap Introduced pointer type. char *str; Comparison with fixed-size arrays. Lets us have dynamically-sized arrays. c Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 2 / 27 MyString, cont’d : Memory diagram void f() { int x; int a[3]; int *b; } c Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 3 / 27 MyString, cont’d : Using dynamic arrays int a[3]; int *b; b = new int[3]; a[0] = 2; b[0] = 2; delete[] b; c Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 4 / 27 MyString, cont’d : Stack memory management C++ constructs all variables that come into scope And destructs all variables going out of scope Simple, predictable, safe. c Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 5 / 27 MyString, cont’d : MyString Implementation c Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 6 / 27
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Pointer Basics : We’ve seen some already. Declaration. Allocation/deletion of arrays. Use of arrays. Pointers are more than dynamic arrays. c Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 7 / 27 Pointer Basics : & “Address of” operator. Obtain a pointer to something that already exists. Unlike new where we create something. c Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 8 / 27 Pointer Basics : * “Dereference” operator. Make use of what the pointer points to. int *x = ...; x is a pointer *x is an integer c Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 9 / 27 Pointer Basics : Pointer values int *p = ...; p = ...; changes where p points. *p = ...; changes the memory where p points, which is an integer. c Van Wyk and Kaminski CSci 1113: C/C++ for Scientists and Engineers, evening class Spring 2010 Page 10 / 27 Pointer Basics : new & gives us the address of something existing.
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