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This program creates three similar but different functions called sqr_it( ), each of which returns the square of its argument As the program illustrates, the compiler knows which function to use in each case because of the type of the argument The value of overloaded functions is that they allow related sets of functions to be accessed using a common name In a sense, function overloading lets you create a generic name for an operation; the compiler resolves which function is actually needed to perform the operation Function overloading is important because it can help manage complexity To understand how, consider this example C++ Builder contains the functions itoa( ), ltoa( ), and ultoa( ) in its standard library Collectively, these functions convert different types of numbers (integers, long integers, and unsigned integers) into their string equivalents Even though these functions perform almost identical actions, in C three different names must be used to represent these tasks, which makes the situation more complex than it actually is Even though the underlying concept of each function is the same, the programmer has three things to remember However, in C++ it is possible to use the same name, such as numtoa( ), for all three functions Thus, the name numtoa( ) represents the general action that is being performed It is left to the compiler to choose the specific version for a particular circumstance; the programmer need only remember the general action being performed Therefore, by applying polymorphism, three things to remember are reduced to one If you expand the concept, you can see how polymorphism can help you manage very complex programs A more practical example of function overloading is illustrated by the following program There are no library functions that prompt the user for input and then wait for a response, but it is possible to create one This program creates three functions called prompt( ) that perform this task for data of types int, double, and long:.

#include <iostream> using namespace std; void prompt(char *str, int *i); void prompt(char *str, double *d); void prompt(char *str, long *l);

20:

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int main() { int i; double d; long l; prompt("Enter an integer: ", &i); prompt("Enter a double: ", &d); prompt("Enter a long: ", &l); cout << i << " " << d << " " << l; return 0; } // Prompt for an int void prompt(char *str, int *i) { cout << str; cin >> *i; } // Prompt for a double void prompt(char *str, double *d) { cout << str; cin >> *d; } // Prompt for a long void prompt(char *str, long *l) { cout << str; cin >> *l; }

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You can use the same name to overload unrelated functions, but you should not For example, you could use the name sqr_it( ) to create functions that return the square of an int and the square root of a double However, these two operations are fundamentally different, and applying function overloading in this manner defeats its purpose In practice, you should only overload closely related operations

Another way that polymorphism is achieved in C++ is through operator overloading For example, in C++ you can use the << and >> operators to perform console I/O operations This is possible because in the <iostream> header, these operators are overloaded When an operator is overloaded, it takes on an additional meaning relative to a certain class However, it still retains all of its old meanings In general, you can overload C++ s operators by defining what they mean relative to a specific class For example, think back to the queue class developed earlier in this chapter It is possible to overload the + operator relative to objects of type queue so that it appends the contents of one queue to another However, the + still retains its original meaning relative to other types of data Because operator overloading is, in practice, somewhat more complicated than function overloading, examples are deferred until 22, when the subject is covered in detail

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