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These header files are used the same way as <iostream. h>. For example, if you want the random number function rand( ), place #include <stdlib. h> at the beginning of your main program file. User-Defined Functions The functions provided by libraries are not sufficient for all problems. Programmers must be able to define their own functions. Example 4.3 A cube() Function Here is a simple example of a user-defined function: // returns the cube of the given integer: int cube(int x) {
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The int function returns the cube of the int argument, so cube(2) would return 8. A user-defined function has two parts: its header and its body. The header of a function specifies its return type, name, and parameter list. In Ex. 4.3, the return type is int, the name is cube, and the parameter list is int x. Thus the header for the cube function is int cube (int x) The body of a function is the block of code that follows its header. It contains the code that performs the function's action, including the return statement that specifies the value that the function sends back to the place where it was called. The body of the cube function is { return x*x*x; } This body is about as simple as a function could have. Usually the body is much larger. But the function's header typically fits on a single line. A function's return statement serves two purposes: it terminates the function, and it returns a value to the calling program. Its syntax is return expression; where expression is any expression whose value could be assigned to a variable whose type is the same as the function's return type. Test Drivers Whenever you create your own function, you should test it with a simple program called a test driver. Its only purpose is to test the function. It is a temporary, ad hoc program that can be "quick and dirty." You need not include all the usual niceties of user prompts, output labels, and documentation.
Don't Forget! Once you have used a test driver, discard it.
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Example 4.4 A Test Driver for the cube() Function Here is a program, with our cube function followed by a test driver: // returns the cube of the given integer: int cube(int x) { return x*x*x; } // Test driver for the cube function: main ( ) { int n=l; while (n != O) { cin >>n; cout <<cube(n) <<endl; } } This reads integers and prints their cubes until the user inputs the sentinel value 0. Each integer read is passed to the cube function by the call cube (n). The value returned by the function replaces the expression cube (n) and is then passed to the output object cout. Note that we omitted the #include <iostream.h> directive. This directive of course is required for every program that uses cin or cout. It is omitted from further examples only to save space. We can visualize the relationship between the main() function and the cube() function like this:
The main() function passes the value 5 to the cube() function, and the cube() function returns 125 to the main() function. The actual parameter n is passed by value to the formal parameter x. This simply means that x is assigned the value of n when the function is called. Note that the cube() function is defined above the main() function in the example. This is because the C++ compiler must know about the cube() function before it is used in main(). The next example shows a user-defined function named max(), which returns the larger of the two ints passed to it. This function has two arguments.
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