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Description
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Declares the as s er t ( ) function Declares functions to test characters Declares constants relevant to floats Defines the integer limits on your local system Declares mathematical functions Declares functions for standard input and output Declares utility functions Declares functions for processing strings Declares time and date functions
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These are Standard C header files. They are used the same way that Standard C++ header files such as < ios t ream. h> are used. For example, if you want to use the random number function
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FUNCTIONS
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rand ( ) from the <s tdlib . h> header file, include the following preprocessor directive at the beginning of your main program file: #include <stdlib.h>
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The Standard C Library is described in greater detail in 14.
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4.2 USER-DEFINED FUNCTIONS
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The great variety of functions provided by the C and C++ libraries is still not sufficient for most programming tasks. Programmers also need to be able to define their own functions.
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EXAMPLE 4.3 A cube ( ) Function
Here is a simple example ofa user-defined function:
// Returns the cube of the given integer: int cube(int x) Ic return x*x*x;
The function returns the cube of the integer passed to it. Thus 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 Example 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* I
This is about as simple a body 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.
4.3 TEST DRIVERS
Whenever you create your own function, you should immediately test it with a simple program. Such a program is called a test driver for the function. Its only purpose is to test the function. It is a temporary, ad hoc program that should be quick and dirty. That means that
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FUNCTIONS
you need not include all the usual niceties such as user prompts, output labels, and documentation. Once you have used it to test your function thoroughly you can discard it.
EXAMPLE 4.4 A Test Driver for the cube ( ) Function
Here is a complete program, consisting of 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: main0 { int n = 1; while (n != 0) { tin >> n; tout << cube(n) CC 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 then is passed to the output object tout. Note that we omitted the # include < ios tream . h> directive. This directive of course is required for every program that uses tin or tout. 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 the value 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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