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pshichka [43]
2 years ago
13

Write a program that prompts the user to enter the month and year and displays the number of days in the month. For example, if

the user entered month 2 and year 2000, the program should display that February 2000 has 29 days. If the user entered month 3 and year 2005, the program should display that March 2005 has 31 days.Here is a sample run of this program:Enter a month in the year (e.g., 1 for Jan): 1Enter a year: 2009January 2009 has 31 daysExercise 3.11Liang, Y. Daniel. Introduction to Java Programming (8th Edition)
Computers and Technology
1 answer:
valentinak56 [21]2 years ago
3 0

Answer:

Following are the program in JAVA language  

import java.util.Scanner; // import package

import java.util.Calendar; // import package

public class Main // class main  

{  

public static void main(String[] args) // main function  

{  

Scanner input = new Scanner(System.in); // for user input  

Calendar calendar = Calendar.getInstance(); //get calendar instance for methods  

int nYear , nMonth , date =1 , nDays;

String MonthOfName = "";

 System.out.print(" Enter a month in the year :");

 nMonth = input.nextInt(); //input Month

 System.out.print("Enter a year :");

 nYear = input.nextInt(); //Input Year

 switch (nMonth) //Find month name via 1-12

 {

  case 1:

MonthOfName = "January";

nMonth = Calendar.JANUARY;

break;

case 2:

MonthOfName = "February";

nMonth = Calendar.FEBRUARY;

break;

case 3:

 MonthOfName = "March";

nMonth = Calendar.MARCH;

break;

 case 4:

 MonthOfName = "April";

nMonth = Calendar.APRIL;

 break;

 case 5:

MonthOfName = "May";

nMonth = Calendar.MAY;

break;

case 6:

MonthOfName = "June";

nMonth = Calendar.JUNE;

break;

case 7:

 MonthOfName = "July";

nMonth = Calendar.JULY;

break;

 case 8:

MonthOfName = "August";

nMonth = Calendar.AUGUST;

break;

case 9:

MonthOfName = "September";

nMonth = Calendar.SEPTEMBER;

break;

case 10:

MonthOfName = "October";

nMonth = Calendar.OCTOBER;

break;

case 11:

 MonthOfName = "November";

nMonth = Calendar.NOVEMBER;

break;

case 12:

MonthOfName = "December";

nMonth =Calendar. DECEMBER;

         }        

 calendar.set(nYear, nMonth, date); // set date to calender to get days in month

nDays=calendar.getActualMaximum(Calendar.DAY_OF_MONTH); // get no of days in month

System.out.println(MonthOfName + " " + nYear + " has " + nDays + " days."); //print output

}

}

Output:

Enter a month in the year : : 09

Enter a year : 2019

September 2019 has 30 days.

Explanation:

In this program we have take two user input one for the  month and other for the year Also take two variables which are used for storing the month name and no of days in a month. with the help of switch we match  the cases  and store the month value .After that  set the date to calender with help of calendar.set(nYear, nMonth, date) method and  To get the number of days from a month  we use  calendar.getActualMaximum(Calendar.DAY_OF_MONTH);  method and finally print year and days.

 

     

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Redo Programming Exercise 16 of Chapter 4 so that all the named constants are defined in a namespace royaltyRates. PLEASE DONT F
Komok [63]

Answer:

Code is given below and output is attached in the diagram:

Explanation:

//Use this header file while using visual studio.

#include "stdafx.h"

//Include the required header files.

#include<iostream>

//Use the standard naming convention.

using namespace std;

//Define a namespace royaltyRates.

namespace royaltyRates

{

    //Declare and initialize required named constants.

    const double PAY_ON_DELIVERY_OF_NOVAL = 5000;

    const double PAY_ON_PUBLISH_OF_NOVAL = 20000;

    const double PER_ON_NET_PRICE_SECOND_OPTION =

    0.125;

    const double PER_ON_NET_PRICE_FIRST_4000 = 0.1;

    const double PER_ON_NET_PRICE_OVER_4000 = 0.14;

};

//Start the execution of main() method.

int main()

{

    //Declare and initialize the required variables

    //which are going to be used to calculate

    //royalities under each option.

    float net_price;

    int num_copies;

    float royaltyUnderOption1, royaltyUnderOption2,

    royaltyUnderOption3;

    royaltyUnderOption1 = royaltyUnderOption2

    = royaltyUnderOption3 = 0;

    //Prompt the user to enter the net price of each

    //novel.

    cout << "Please enter the net price for each ";

    cout << "copy of the novel : ";

    cin >> net_price;

    //Prompt the user to enter the estimated number

    //of copies of the novels to be sold.

    cout << "Please enter the estimated number ";

    cout << "of copies to be sold : ";

    cin >> num_copies;

    //Display the required details and royalty

    //calculated under option 1.

    cout << "\n*** Option 1: ****" << endl;

    cout << "Net price of each novel: $" << net_price;

    cout << endl;

    cout << "Estimated number of copies to be sold ";

    cout << "is: " << num_copies << endl;

    cout << "$";

    cout << royaltyRates::PAY_ON_DELIVERY_OF_NOVAL;

    cout << " is paid to author for the delivery of ";

    cout << "the final manuscript and $";

    cout << royaltyRates::PAY_ON_PUBLISH_OF_NOVAL;

    cout << " is paid for the publication of ";

    cout << "novel." << endl;

    royaltyUnderOption1 =

    royaltyRates::PAY_ON_DELIVERY_OF_NOVAL +

    royaltyRates::PAY_ON_PUBLISH_OF_NOVAL;

    cout << "Total amount of royalty under option 1 ";

    cout << "is $" << royaltyUnderOption1 << endl;

    //Display the required details and royalty

    //calculated under option 2.

    cout << "\n*** Option 2: ****" << endl;

    cout << "Net price of each novel: $";

    cout << net_price << endl;

    cout << "Estimated number of copies to be sold ";

    cout << "is: " << num_copies << endl;

    royaltyUnderOption2 =

   (royaltyRates::PER_ON_NET_PRICE_SECOND_OPTION *

    net_price)* num_copies;

    cout << "Total amount of royalty under option 2 ";

    cout << "is $" << royaltyUnderOption2 << endl;

    //Display the required details and royalty

    //calculated under option 3.

    cout << "\n*** Option 3: ****" << endl;

    cout << "Net price of each novel: $" << net_price;

    cout << endl;

    cout << "Estimated number of copies to be sold ";

    cout << "is: " << num_copies << endl;

    //If the number of copies is greater than 4000.

    if (num_copies > 4000)

    {

         //Total amount of royalty will be 10% of net

         //price of first 4000 copies and 14 % of net

         //price of copies sold over 4000.

         royaltyUnderOption3 =

         (royaltyRates::PER_ON_NET_PRICE_FIRST_4000 *

         net_price) * 4000 +

         (royaltyRates::PER_ON_NET_PRICE_OVER_4000 *

         net_price) * (num_copies - 4000);

    }

    //Otherwise,

    else

    {

         //Total amount of royalty will be 10% of net

         //price of first 4000 copies.

         royaltyUnderOption3 =

         (royaltyRates::PER_ON_NET_PRICE_FIRST_4000 *

         net_price) * num_copies;

    }

    cout << "Total amount of royalty under option 3 ";

    cout << "is $" << royaltyUnderOption3 << endl;

    //If the royalty under option 1 is greater than

    //royalty under option 2 and 3, then option 1 is

    //best option.

    if (royaltyUnderOption1 > royaltyUnderOption2 &&

    royaltyUnderOption1 > royaltyUnderOption3)

    {

         cout << "\nOption 1 is the best option that ";

         cout << "author can choose." << endl;

    }

    //If the royalty under option 2 is greater than

    //royalty under option 1 and 3, then option 2 is

    //best option.

    else if (royaltyUnderOption2 > royaltyUnderOption1

    && royaltyUnderOption2 > royaltyUnderOption3)

    {

         cout << "\nOption 2 is the best option that ";

         cout << "author can choose." << endl;

    }

    //If the royalty under option 3 is greater than

    //royalty under option 1 and 2, then option 3 is

    //best option.

    else

    {

         cout << "\nOption 3 is the best option that ";

         cout << "author can choose." << endl;

    }

    //Use this command while using visual studio.

    system("pause");

    return 0;

}

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