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Dynamic Memory Allocation (cont)

In many applications, fixed-size data is ok.

In many other applications, we need flexibility.

Examples: 

char name[MAXNAME];  // how long is a name?
char line[MAXLINE];  // what's the longest line?
char words[MAXWORDS][MAXWORDLENGTH];
                     // how many words are there?
                     // how long is each word?

With fixed-size data, we need to guess sizes  ("large enough").