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int main() { // tests the printDate() function: int month, day, year; do { cin >> month >> day >> year; printDate(month,day,year); } while (month > 0); } void printDate(int m, int d, int y) { // prints the given date in literal form: if (m < 1 || m > 12 || d < 1 || d > 31 || y < 0) { cerr << "Error: parameter out of range.\n"; return; } switch (m) { case 1: cout << "January "; break; case 2: cout << "February "; break; case 3: cout << "March "; break; case 4: cout << "April "; break; case 5: cout << "May "; break; case 6: cout << "June "; break; case 7: cout << "July "; break; case 8: cout << "August "; break; case 9: cout << "September "; break; case 10: cout << "October "; break; case 11: cout << "November "; break; case 12: cout << "December "; break; } cout << d << ", " << y << endl; } 12 7 1941 December 7, 1941 5 16 1994 May 16, 1994 0 0 0 Error: parameter out of range. The printDate() function returns no value. Its only purpose is to print the date. So its return type is void. The function uses a switch statement to print the month as a literal, and it prints the day and year as integers. Note that the function returns without printing anything if the parameters are obviously out of range (e.g., m > 12 or y < 0). But impossible values such as February 31, 1996 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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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 printDate instead of some noun phrase like date. 5.8 BOOLEAN FUNCTIONS In some situations it is helpful to use a function to evaluate a condition, typically within an if statement or a while statement. Such functions are called boolean functions after the British logician George Boole (1815-1864) who developed boolean algebra. EXAMPLE 5.12 Classifying Characters
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The following program classifies the 128 ASCII characters (see Appendix A): #include <cctype> // defines the functions isdigit(), islower(), etc. #include <iostream> // defines the cout object using namespace std;
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