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EXAMPLE 5.4 A Test Driver for the cube() Function
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Here is a complete program that includes the definition of the cube() function from Example 5.4 together with a test driver for it: int cube(int x) { // returns cube of x: return x*x*x; }
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int main() { // tests the cube() function: int n=1; while (n != 0) { cin >> n; cout << "\tcube(" << n << ") = " << cube(n) << endl; } } 5 cube(5) = 125 -6 cube(-6) = -216 0 cube(0) = 0 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 cout.
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main() cube() We can visualize the relationship between the main() function and 5 n 5 x 5 the cube() function like this: int int The main() function passes the 125 value 5 to the cube() function, and the cube() function returns the value 125 to the main() function. The argument 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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EXAMPLE 5.5 A Test Driver for the max() Function
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Here is a function with two parameters. It returns the larger of the two values passed to it. int max(int x, int y) { // returns larger of the two given integers: if (x < y) return y; else return x; }
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int main() { // tests the max() function: int m, n; do { cin >> m >> n; cout << "\tmax(" << m << "," << n << ") = " << max(m,n) << endl; } while (m != 0); } 5 8 max(5,8) = 8 4 -3 max(4,-3) = 4 0 0 max(0,0) = 0 Notice that the function has more than one return statement. The first one that is reached terminates the function and returns the indicated value to the calling program.
A return statement is like a break statement. It is a jump statement that jumps out of the function that contains it. Although usually found at the end of the function, a return statement may be put anywhere that any other statement could appear within a function. 5.5 FUNCTION DECLARATIONS AND DEFINITIONS The last two examples illustrate one method of defining a function in a program: the complete definition of the function is listed above the main program. This is the simplest arrangement and is good for test drivers. Another, more common arrangement is to list only the function s header above the main program, and then list the function s complete definition (head and body) below the main program. This is illustrated in the next example. In this arrangement, the function s declaration is separated from its definition. A function declaration is simply the function s head, followed by a semicolon. A function definition is the complete function: header and body. A function declaration is also called a function prototype. A function declaration is like a variable declaration; its purpose is simply to provide the compiler with all the information it needs to compile the rest of the file. The compiler does not need to know how the function works (its body). It only needs to know the function s name, the number and types of its parameters, and its return type. This is precisely the information contained in the function s head. Also like a variable declaration, a function declaration must appear above any use of the function s name. But the function definition, when listed separately from the declaration, may appear anywhere outside the main() function and is usually listed after it or in a separate file. The variables that are listed in the function s parameter list are called parameters. They are local variables that exist only during the execution of the function. Their listing in the parameter list constitutes their declaration. In the example above, the parameters are x and y. The variables that are listed in the function s calls are called the arguments. Like any other variable in the main program, they must be declared before they are used in the call. In the example above, the arguments are m and n.
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