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When a function calls itself, new local variables and parameters are allocated storage on the stack, and the function code is executed with these new variables from its beginning A recursive call does not make a new copy of the function Only the arguments are new As each recursive call returns, the old local variables and parameters are removed from the stack and execution resumes at the point of the function call inside the function Recursive functions could be said to telescope out and back Most recursive functions are not smaller than their iterative counterparts The recursive versions of most routines may execute a bit more slowly than the iterative equivalents because of the added function calls; but this slightly increased overhead is not a significant concern for most situations Many recursive calls to a function could cause a stack overrun Because storage for function parameters and local variables is on the stack and each new call creates a new copy of these variables, the stack space could become exhausted If this happens, a stack overflow occurs The main advantage to recursive functions is that they can be used to create versions of several algorithms that are clearer and simpler than their iterative equivalents For example, the QuickSort sorting algorithm is quite difficult to implement in an iterative way Some problems, especially artificial intelligence related ones, also seem to lend themselves to recursive solutions Finally, some people seem to think recursively more easily than iteratively When writing recursive functions, you must have a conditional statement, such as an if, somewhere to force the function to return without the recursive call being executed If you don t, the function will never return once you call it This is a very common error when writing recursive functions Use printf( ) and getchar( ) liberally during development so that you can watch what is going on and abort execution if you see a mistake.

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While the book attempts to cover a rather broad and diverse topic with reasonable depth, it is consciously restricted in scope to avoid becoming unwieldy, difficult to follow and consequently, less effective The specific constraints are noted below

A particularly confusing yet powerful feature is the function pointer Even though a function is not a variable, it still has a physical location in memory that can be assigned to a pointer The address assigned to the pointer is the entry point of the function This pointer can then be used in place of the function s name It also allows functions to be passed as arguments to other functions To understand how function pointers work, you must understand a little about how a function is compiled and called As each function is compiled, source code is transformed into object code and an entry point is established When a call is made to a function while your program is running, a machine language call is made to this entry point Therefore, a pointer to a function actually contains the memory address of the entry point of the function The address of a function is obtained by using the function s name without any parentheses or arguments (This is similar to the way an array s address is obtained by

using only the array name without indexes) For example, consider the following program, paying very close attention to the declarations:

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#include <stdioh> #include <stringh> void check(char *a, char *b, int (*cmp) (const char *, const char *)); int main(void) { char s1[80], s2[80]; int (*p)(const char*, const char*); p = strcmp; gets(s1); gets(s2); check(s1, s2, p); return 0; } /* get address of strcmp() */

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void check(char *a, char *b, int (*cmp) (const char *, const char *)) { printf("Testing for equality\n"); if(!(*cmp) (a, b)) printf("Equal"); else printf("Not equal"); }

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When the function check( ) is called, two character pointers and one function pointer are passed as parameters Inside the function check( ), the arguments are declared as character pointers and a function pointer Notice how the function pointer is declared You should use the same method when declaring other function pointers, except that the return type or parameters of the function can be different The parentheses around the *cmp are necessary for the compiler to interpret this statement correctly When you declare a function pointer, you can still provide a prototype to it as the preceding program illustrates In many cases, however, you won t know the names of the actual parameters, so you can leave them blank, or you can use any names you like Once inside check( ), you can see how the strcmp( ) function is called The statement

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