Question

// This program displays a menu and asks the user to make a
2 // selection. An if/else if statement determines which item
3 // the user has chosen.
4 #include <iostream>
5 #include <iomanip>
6 using namespace std;
7
8 int main()
9 {
10 int choice; // To hold a menu choice
11 int months; // To hold the number of months
12 double charges; // To hold the monthly charges
13
14 // Constants for membership rates
15 const double ADULT = 40.0,
16 SENIOR = 30.0,
17 CHILD = 20.0;
18
19 // Constants for menu choices
20 const int ADULT_CHOICE = 1,
21 CHILD_CHOICE = 2,
22 SENIOR_CHOICE = 3,
23 QUIT_CHOICE = 4;
24
25 // Display the menu and get a choice.
26 cout << "\t\tHealth Club Membership Menu\n\n"
27 << "1. Standard Adult Membership\n"
28 << "2. Child Membership\n"
29 << "3. Senior Citizen Membership\n"
30 << "4. Quit the Program\n\n"
31 << "Enter your choice: ";
32 cin >> choice;
33
34 // Set the numeric output formatting.
35 cout << fixed << showpoint << setprecision(2);
36
37 // Respond to the user's menu selection.
38 if (choice == ADULT_CHOICE)
39 {
40 cout << "For how many months? ";
41 cin >> months;
42 charges = months * ADULT;
43 cout << "The total charges are $" << charges << endl;
44 }
(program continues)
M04_GADD6253_07_SE_C04 Page 191 Tuesday, January 4, 2011 9:03 PM
192 Chapter 4 Making Decisions
Let s take a closer look at the program:
Lines 10 12 define the following variables:
The choice variable will hold the user s menu choice
The months variable will hold the number of months of health club membership
The charges variable will hold the total charges
Lines 15 17 define named constants for the monthly membership rates for adult,
senior citizen, and child memberships.
Lines 20 23 define named constants for the menu choices.
Lines 26 32 display the menu and get the user s choice.
Line 35 sets the numeric output formatting for floating point numbers.
45 else if (choice == CHILD_CHOICE)
46 {
47 cout << "For how many months? ";
48 cin >> months;
49 charges = months * CHILD;
50 cout << "The total charges are $" << charges << endl;
51 }
52 else if (choice == SENIOR_CHOICE)
53 {
54 cout << "For how many months? ";
55 cin >> months;
56 charges = months * SENIOR;
57 cout << "The total charges are $" << charges << endl;
58 }
59 else if (choice == QUIT_CHOICE)
60 {
61 cout << "Program ending.\n";
62 }
63 else
64 {
65 cout << "The valid choices are 1 through 4. Run the\n"
66 << "program again and select one of those.\n";
67 }
68 return 0;
69

----

how can i write a program like this but in java.

Answer 1

import java.io.*; //importing all I/O libraries
public class Health //name of the class
{
public static void main(String args[])throws IOException
{
   BufferedReader br=new BufferedReader(new InputStreamReader(System.in));   /*BufferedReader is a class in Java that reads text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, lines and arrays*/
   int choice,months;
   double charges;
   final double adult=40; //instead of const keyword in C++, we use final. final acts as const in java
   final double senior=30;
   final double child=20;
   final int adult_choice=1;
   final int child_choice=2;
   final int senior_choice=3;
   final int quit_hoice=4;
   System.out.println( "\t\tHealth Club Membership Menu\n\n1. Standard Adult Membership\n2. Child Membership\n3. Senior Citizen Membership\n4. Quit the Program\n\nEnter your choice: ");
   System.out.println();
   choice=Integer.parseInt(br.readLine()); //Input as Integer.
   if(choice==adult_choice)
   {
       System.out.println("For how many months?");
       months=Integer.parseInt(br.readLine());
       charges=months*adult;
       System.out.print("The total charges are: $");
       System.out.print(charges);
       System.out.println();
   }
   else if(choice==child_choice)
   {
       System.out.println("For how many months?");
       months=Integer.parseInt(br.readLine());
       charges=months*child;
       System.out.print("The total charges are: $");
       System.out.print(charges);
       System.out.println();
   }
   else if(choice==senior_choice)
   {
       System.out.println("For how many months?");
       months=Integer.parseInt(br.readLine());
       charges=months*senior;
       System.out.print("The total charges are: $");
       System.out.print(charges);
       System.out.println();
   }
   else if(choice==quit_hoice)
   {
       System.out.println("Program Ending\n");
   }
   else
   {
       System.out.println("The valid choices are 1 through 4. Run the program again and select one of those.");
   }

}
}

Output:

Note:

To compile a program in java through cmd use keyword: javac filename.java

then type

java filename

Hope this helps you,

Thank You.