Understanding and Using C Pointers by Richard Reese

Author:Richard Reese
Language: eng
Format: epub, pdf
Tags: COMPUTERS / Programming Languages / C
ISBN: 9781449344177
Publisher: O’Reilly Media
Published: 2013-05-01T16:00:00+00:00

char header[32];

A pointer to a character is illustrated below. Since it has not been initialized, it does not reference a string. The string’s length and location are not specified at this time.

char *header;

The String Literal Pool

When literals are defined they are frequently assigned to a literal pool. This area of memory holds the character sequences making up a string. When a literal is used more than once, there is normally only a single copy of the string in the string literal pool. This will reduce the amount of space needed for the application. Since a literal is normally considered to be immutable, it does not hurt to have a single copy of it. However, it is not a good practice to assume there will only be a single copy or that literals are immutable. Most compilers provide an option to turn off string pooling. When this happens, literals may be duplicated, each having their own address.

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