'Int px' presentation slideshows

Pointers

Pointers. Pointers. What is pointer? A variable (2 or 4 bytes long) that can hold an Address Why pointers? Sometimes the only way to express a computation Usually lead to compact and efficient code Related operators: - * : can be used in two ways

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Lecture # 9

Lecture # 9. Array of Strings . It can be declared as: Where MAX: is the array size, LEN: is the maximum string length. static char[MAX][LEN]. Initialization of Array of Strings. In this example, we reserved 40 char for each string and used only 8. #define MAX 5 #define LEN 40

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Pointers

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Pointers

Pointers.

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Pointers

Pointers. Value, Address, and Pointer. Values and Addresses. int x, y, z;. x = 5;. x. y = x + 5;. y. z = y + 5;. z. values of x, y, and z x is 5 y is 10 z is 15. addresses of x, y, and z &x is 70000 &y is 70004 &z is 70008. Example 1. #include < stdio.h >

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Pointers Quick Start Without the fluff

Pointers Quick Start Without the fluff. Pointers are variables that point to other variables. Think of them as aliases. Simple pointers. int x; // a variable of type int int *px; // a pointer-type variable // of type pointer to int. X = 3; // put 3 in x

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Review

Review. Declaring a variable allocates space for the type of datum it is to store int x; // allocates space for an int int *px; // allocates space for a pointer to an int Pointer and pointee are different Space for pointee must be allocated before pointer dereferencing is sensible

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