Question

Need help with a few programming exercises. The language being used for all of them is JAVA.

1) exercises - branching (language is JAVA)

• Write a method whatToWear(int temp) that takes a temperature and then outputs a string for what to wear in different weather conditions. There must be at least 3 categories. For example, whatToWear(90) might return “shorts” and whatToWear(30) might return “down coat”

2) Enum exercise

• Define an enum Seasons, and rewrite the whatToWear method to use enums and switch statement

3) Loops exercise

• Expected cost

• Each year the expected cost of an item increases by the amount of inflation. For example

• expectedCostNextYear = cost*(1+inflation) • where inflation might by .04, representing 4%.

• Write a method which takes inputs: cost, inflation, years and returns expected cost in n years.

4) Loops exercise

Rewrite the previous code using a while loop (number 3)

5) Nested Loop exercise

• Write a program to create the pattern, shown below for n=5, for any n

1

1 2

1 2 3

1 2 3 4

1 2 3 4 5

6) for-each exercise

• Create an array of words • Use a for-each loop to print out the number of characters in each word

7) Partially Filled Array exercise

• Write a program that allocates an array of 50 strings.

• Ask the user to input city names to store in the array until the user enters “quit”.

8) 2D array exercise

1. write a method columnSum(int[][] a, int col) that returns the sum of the values of column col

2. Write a method public static boolean isSquare(int[][] a) that checks if the array is square (i.e. every row has the same length as a itself)

9) Classes Exercise

• Consider a class Student •

Think of four instance variables

• Write four possible constructors

10) Classes exercise

• Define a class BlogEntry that has variables

• username

• text

• date

• Methods

• getters/setters

• displayEntry()

• getSummary() // return first 10 words

Thanks in advance for your help!

Answer 1

3)

// InflationAmount.java

public class InflationAmount {

   public static void main(String[] args) {
       double cost=5000,inflation=0.04;
       int years=10;
      
      
double expectedCost=calExpectedCost(cost,inflation,years);
   System.out.println("Expected Cost :$"+expectedCost);

   }

   private static double calExpectedCost(double cost, double inflation, int years) {
       double expectedCostNextYear = 0;
   for(int i=0;i<years;i++)
   {
       expectedCostNextYear = cost*(1+inflation);
               cost=expectedCostNextYear;
   }
       return expectedCostNextYear;
   }

}

________________________

Output:

Expected Cost :$7401.221424591723

________________________

4)

public class InflationAmount {

   public static void main(String[] args) {
       double cost=5000,inflation=0.04;
       int years=10;
      
      
double expectedCost=calExpectedCost(cost,inflation,years);
System.out.println("Expected Cost :$"+expectedCost);

   }

   private static double calExpectedCost(double cost, double inflation, int years) {
       double expectedCostNextYear = 0;

      
       int i=0;
       while(i<years)
       {
           expectedCostNextYear = cost*(1+inflation);
           cost=expectedCostNextYear;
           i++;
       }
       return expectedCostNextYear;
   }

}
_______________________________

Output:

Expected Cost :$7401.221424591723

_______________________________

5)

// LoopPattern.java

import java.util.Scanner;

public class LoopPattern {

   public static void main(String[] args) {
int n;
    /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);
       System.out.print("Enter n:");
       n=sc.nextInt();
       for(int i=1;i<=n;i++)
       {
       for(int j=1;j<=i;j++)
       {
           System.out.print(j+" ");
       }
       System.out.println();
       }
      

   }

}
_____________________________

Output:

Enter n:5
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

______________________________

6)

// WordLength.java

public class WordLength {

   public static void main(String[] args) {
String words[]={"Hello","Wonderful","Maria","Great","Message","Monitor"};
for(int i=0;i<words.length;i++)
{
   System.out.println("No of Characters in \""+words[i]+"\" :"+words[i].length());
}
  

   }

}

_______________________

Output:

No of Characters in "Hello" :5
No of Characters in "Wonderful" :9
No of Characters in "Maria" :5
No of Characters in "Great" :5
No of Characters in "Message" :7
No of Characters in "Monitor" :7

_______________________

7)

// PartiallyFilledArray.java

import java.util.Scanner;

public class PartiallyFilledArray {

   public static void main(String[] args) {
       final int MAX=50;
       String words[]=new String[MAX];
       int cnt=0;
      
       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);
       System.out.print("Enter word (quit to exit) :");
       String word=sc.next();
       while(!word.equalsIgnoreCase("quit"))
       {
           words[cnt]=word;
           cnt++;
           System.out.print("Enter word (quit to exit) :");
           word=sc.next();
       }
      
       System.out.println("\nDisplaying the words :");
       for(int i=0;i<cnt;i++)
       {
           System.out.println(words[i]);
       }
      
      

   }

}
__________________________

Output:

Enter word (quit to exit) :hello
Enter word (quit to exit) :sachin
Enter word (quit to exit) :great
Enter word (quit to exit) :beautiful
Enter word (quit to exit) :sara
Enter word (quit to exit) :quit

Displaying the words :
hello
sachin
great
beautiful
sara

_______________________Thank You