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EXAMPLE 4.5 A Test Driver for the max ( )
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Here is a function with two parameters. It returns the larger of the twp values passed to it:
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// Returns the larger of the two given integers: int max(int x, int y) -l if (x < y) return y; else return x; > main0 int m, n; do 1 tin >> m >> n; tout << max(m,n) << endl; } while (m != 0);
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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.
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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.
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4.4 FUNCTION DECLARATIONS AND DEFINITIONS
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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 (header 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 header, 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 header. 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 calledfownal parameters or formal arguments. They are local variables that exist only during the execution of the function.
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FUNCTIONS
Their listing in the parameter list constitutes their declaration. In the example above, the formal parameters are x and Y. The variables that are listed in the function s calls are called the actual parameters or actual 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 actual parameters are m and n. In these examples, the actual parameters arepassed by value. This means that their values are assigned to the function s corresponding formal parameters. So in the previous example, the value of m is assigned to x and the value of n is assigned to Y. When passed by value, actual parameters may be constants or general expressions. For example, the max ( ) function could be called by max ( 44,~ *m-n > . This would assign the value 44 to x and the value of the expression
5*m-n
t0 y
EXAMPLE 4.6 The max ( ) Function with Declaration Separate from Definition
This program is the same test driver for the same max ( ) function as above. But here the function s declaration appears above the main program and the function s definition follows it:
int max(int, int);
// Test driver for the max function: main0 -t int m, n; do 1 tin >> m >> n; tout << max(m,n) << endl; } while (m != 0);
// Returns the larger of the two given integers: int max(int x, int y) t if (x < y) return y; else return x;
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