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How old are you: 125 You could not be over 120. Try again. How old are you: -3 Your age could not be negative. Try again. How old are you: 99 You are 99 years old.
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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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5.10 PASSING BY 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 argument in the function call. For example the cube() function could also be called as cube(3), or as cube(2*x-3), or even as cube(2*sqrt(x)-cube(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 usually want for functions. It makes the functions more self-contained, protecting them 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, &, to the type specifier in the functions parameter list. This makes the local variable a reference to the argument passed to it. So the argument is read-write instead of read-only. Then any change to the local variable inside the function will cause the same change to the argument that was passed to it. Note that parameters that are passed by value are called value parameters, and parameters that are passed by reference are called reference parameters. EXAMPLE 5.16 The swap() Function
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This little function is widely used in sorting data: void swap(float& x, float& y) { // exchanges the values of x and y: float temp = x; x = y; y = temp; }
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Its sole purpose is to interchange the two objects that are passed to it. This is accomplished by declaring the formal parameters x and y as reference variables: float& x, float& y. The reference operator & makes x and y synonyms for the arguments passed to the function. Here is a test driver and output from a sample run: void swap(float&, float&); // exchanges the values of x and y;
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int main() { // tests the swap() function: float a = 22.2, b = 44.4; cout << "a = " << a << ", b = " << b << endl; swap(a,b); cout << "a = " << a << ", b = " << b << endl; } a = 22.2, b = 44.4 a = 44.4, b = 22.2 When the call swap(a,b) executes, the function creates its local references x and y, so that x is the function s local name for a, and y is the function s local name for b. Then the function s three statements execute: the local variable temp is declared and initialized with the value of x (which is a); then x (which is a) is assigned the value of y (which is b); then y (which is b) is assigned the value of temp. So a ends up with the value 44.4, and b ends up with the value 22.2:
Upon the call swap(a,b):
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