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[CHAP. 4
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Note that the function returns without printing anything if the parameters are obviously out of range ( e.8 ., m > 12 or y < 0). But impossible values such as February 19 , 19 9 6 would be printed. Corrections for these anomalies are left as exercises.
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Since a void function does not return a value, it need not include a return statement. If it does have a return statement, then it should appear simply as
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return;
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with no expression following the keyword return. In this case, the purpose of the return statement is simply to terminate the function.
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A function with no return value is an action. Accordingly, it is usually best to use a verb phrase for its name. For example, the above function is named printDat e instead of some noun phrase like date. 4.8 BOOLEAN FUNCTIONS
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In some situations it is helpful to use a function to evaluate a condition, typically within an f statement or a while statement. Such functions are called boolean functions, after the British logician George Boole (18 15 1864).
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i EXAMPLE 4.11 Classifying Characters
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The following program classifies the 128 ASCII characters:
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#include <iostream.h> #include <ctype.h> // Prints the category to which the given character belongs: void printCharCategory(char c) Ic tout << "The character ['I << c << "1 is a 'I; if (isdigit( tout c< "digit.\n"; else if (islower( tout cc "lower-case letter.\n"; else if (isupper( tout cc "capital letter.\n"; else if (isspace( tout << "white space character.\n"; else if (iscntrl(c)) tout <<; "control character.\n"; else if (ispunct(c)) tout c< "punctuation mark.\n"; else tout << "Error.\n";
main0 1 for (int c = 0; c < 128; c++) printCharCategory(c);
, CHAP. 41 FUNCTIONS 101
The void
islower(),
function printCharCategory()
isupper(), isspace&
calls the six boolean functions isdigit(), i scn trl ( ) , and i spunc t ( ) . Each of these functions is
predefined in the cc type. h> header file. These functions are used to test objects character type (i.e., c type ). Here is part of the output:
The complete output contains 128 lines. This example illustrates several new ideas. The main idea is the use of the boolean functions isdigit(), islower(), isupper(), isspace(), iscntrl (),and ispunct ().Forexample, the call i s space ( c ) tests the character c to determine whether it is a white space character. (There are six white space characters: the horizontal tab character \ t, the newline character \n, the vertical tab character \v, the form feed character \ f, the carriage return character \ r, and the space character.) If c is any of these characters, then the function returns 1 for true ; otherwise it returns 0 for false. Placing the call as the condition in the i f statement causes the corresponding output statement to execute if and only if c is one of these characters. Each character is tested within the printcharcategory ( ) function. Although the program could have been written without this separate function, its use modularizes the program making it more structured. We are conforming here to the general programming principle that recommends that every task be relegated to a separate function.
EXAMPLE 4.12 A Function to Test Primality
Here is a boolean function to test whether a given integer is a prime number.
// Returns 1 if n is prime, 0 otherwise: int isPrime(int n) -t float sqrtp = sqrt(p); if (p < 2) return 0; // 2 is the first prime if (p == 2) return 1; // 2 is the only even prime if (p % 2 == 0) return 0; for (int d = 3; d K= sqrtp; d += 2) if (p % d == 0) return 0; return 1; >
It works by looking for a divisor d of the given number n. It tests divisibility by the value of the condition (n % d = = 0 > . This will be true precisely when d is a divisor of n. In that case, n cannot be a prime number, so the function immediately returns 0 for false. If the for loop finishes without finding any divisor of n, then the function returns 1 for true. We can stop searching for divisors once we get past the square root of n because if n is a product d*a, then one of these factors must be less than or equal to the square root of n. We define that to be a constant so that it only has to be evaluated once; if we had used the condition d < = sqr t ( n ) to control the for loop, it would re-evaluate that square root at the end of each iteration.
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