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EXAMPLE 4.14 A Function for Reading the User s Age
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Here is a simple function that prompts the user for his/her age and then returns it. It is robust in the sense that it rejects any unreasonable integer input. It repeatedly requests input until it receives an integer in the range 1 to 120: int age0 { int n; while (1) { tout << "How old are you: '; tin >> n; if (n c 0) tout << "\a\tYour age could not be negative.'; else if (n > 120) tout CC "\a\tYou could not be over 120."; else return n; tout << "\n\tTry again.\n";
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As soon as the input received from tin is acceptable, the function terminates with a return statement, sending the input back to the calling function. If the input is not acceptable (n c 0 or n > 12 0), then the system beep is sounded by printing the character I\a I and a comment printed. Then the user is asked to Try again. Note that this is an example of a function whose return statement is not at the end of the function. Here is a test driver and output from a sample run: // Prompts the user to input her/her age, and returns that value:' i n t age(); // Test driver for the age0 function: main0 1 int a = age(); tout << "\nYou are ' << a << ' years old.\n"; > Your age could not' Jx.2 negative* Try again, .,. " Eiuw old ax you: 200
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Notice that the function s parameter list is empty. But even though it has no input parameters, the parentheses! ( ) must be included both in the function s header and in every call to the function.
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FUNCTIONS
PASSING
REFERENCE
Until now, all the parameters that we have seen in functions have been passed by value. That means that the expression used in the function call is evaluated first and then the resulting value is assigned to the corresponding parameter in the function s parameter list before the function begins executing. For example, in the call cube (x) , if x has the value 4, then the value 4 is passed to the local variable n before the function begins to execute its statements. Since the value 4 is used only locally inside the function, the variable x is unaffected by the function. Thus the variable x is a read-only parameter. The pass-by-value mechanism allows for more general expressions to be used in place of an actual parameter in the function call. For example the cube function could also be called as tube(3), or as cube(2*x-3), or even as cube(2*sqrt(x)-tube(3)). In each case,the expression within the parentheses is evaluated to a single value and then that value is passed to the function. The read-only, pass-by-value method of communication is usually what we want for functions. It makes the function more self-contained, protecting against accidental side effects. However, there are some situations where a function needs to change the value of the parameter passed to it. That can be done by passing it by reference. To pass a parameter by reference instead of by value, simply append an ampersand 6c to the type specifier in the functions parameter list. This makes the local variable a reference to the actual parameter passed to it. So the actual parameter is read-write instead of read-only. Then any change to the local variable inside the function will cause the same change to the actual parameter that was passed to it.
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