Question

use java and write in text

a. Rewrite the following code segment using if statements. Assume that grade has been declared as of type char. char grade= 'B';; switch (grade) { case 'A': System.out.println("Excellent"); break case 'B': System.out.println("Good"); default: System.out.println("you can do better”); } - b. write Java code that inputs an integer and prints each of its digit followed by ** e.gif the integer is 1234 then it should print 1**2**3**4 e.g. if the integer is 85 then it should output 8**5 c. Given the following: int () arc={1,3,5,9,1}; Write a java function that returns the sum of the prime numbers assume the prime function exists. d. Given the following array initialization double arr_2D[0]={{1,2,3}, {1,4}, {4,5,6}}; Write a function that returns true if the array represents a square matrix. e. A method IsEqual int[A.int[]B) (signature of the method) will accept two Arrays as input and return true if all the values in the two arrays are equal else it will return false.

Answer 1

Answer a: Code using if statement:

package javaProgram;

public class Main {
  
   public static void main(String []args) {
       char grade='B';
       if(grade=='A')
           System.out.println("Excellent");
       else if (grade=='B')
           System.out.println("Good");
       else
           System.out.println("you can do better");
   }
}
-------------------

screenshot:

e Console X <terminated> Main (5) Good Main.java X 1 package javaProgram; 2 3 public class Main { 4. 56 public static void main(String (largs) { 6 char grade='B'; 7 if(grade=='A') 8 System.out.println("Excellent"); 9 else if (grade=='') 10 System.out.println("Good");|| else 12 System.out.println("you can do better"); 13 14 } 15 11 }

Answer b:

Code:

package javaProgram;

import java.util.*;

public class Main {
  
   public static void main(String []args) {
       String reverse="";
       String a="";
       Scanner sc=new Scanner(System.in);
       int n=sc.nextInt();
       a=Integer.toString(n%10);
       n=n/10;
       while(n!=0) {
           int x=n%10;
           a+="**"+x;
           n=n/10;
       }
       for(int i = a.length() - 1; i >= 0; i--)
       {
       reverse = reverse + a.charAt(i);
       }
       System.out.println(reverse);
   }
}

---------------------

screenshot:

2 Main.java X 1 package javaProgram; 2 3 import java.util.*; * 4 5 public class Main { 6 70 8 <terminated> 85 8**5 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 } public static void main(String []args) { String reverse=""; String a=""; Scanner sc=new Scanner(System.in); int n=sc.nextInt(); a=Integer.toString(n%10); n=n/10; while(n!=0){ int x=n%10; a+="**"+x; n=n/10; } for(int i = a.length() - 1; i >= 0; i-- { reverse = reverse + a.charAt(i); } System.out.println(reverse); }

UMP 8 <terminated> 1234 1**2**3**4 Main.java X 1 package javaProgram; 2 3 import java.util.*; 4. 5 public class Main { 6 70 public static void main(String (largs) { String reverse=""; 9 String a=""; 10 Scanner sc=new Scanner(System.in); 11 int h=sc.nextInt(); 12 a=Integer.toString(n%10); 13 n=n/10; while(n!=0) { 15 int x=n%10; 16 '+x; 17 n=n/10; 18 } 19 for(int i = a.length() - 1; i >= 0; i-- 20 21 reverse = reverse + a.charAt(i); 22 23 System.out.println(reverse); 14 a+="*** { } 24 } 25 } 26

Answer c:

Code: Assuming that prime function already exist. Created the code and prime function also.

package javaProgram;

import java.util.*;

public class Main {
  
   static boolean isPrime(int n) {
       boolean flag=true;
       int m=n/2;
       if(n==0||n==1){
           flag=false;
       }
       else{
       for(int i=2;i<=m;i++){
           if(n%i==0){
           flag=false;   
           break;
           }
       }
       }
   return flag;
   }
  
   public static void main(String []args) {
       int[] arr = {1,3,5,9,1};
       int sumArray=0;
       for(int i=0;i<arr.length;i++) {
           if(isPrime(arr[i])==true) {
               sumArray+=arr[i];
           }
       }
       System.out.println("Sum of Prime number: "+sumArray);
   }
}

----------------------------------------------------------

screenshot:

e Console X XX B B E 5 8 <terminated> Main (5) [Java App Sum of Prime number: 8 Main.java x 6 70 static boolean isPrime(int n) { boolean flag=true; 9 int m=n/2; 19 if(n==n=-1){ flag=false; 12 } 13 else{ 14 for(int i=2;i<=m;i++){ 15 if(n%i==0){ 16 flag=false; 17 break; 18 19 } } 20 return flag; 21 22 23 240 25 26 27 28 public static void main(String (jargs) { int[] arr = {1,3,5,9,1}; int sumArray=0; for(int i=0;i<arr.length;i++) { if(isPrime(arr[i])==true) { sumArray+=arr[i]; } System.out.println("Sum of Prime number: "+sumArray); } } 29 30 31 32 33 34 }

Answer d:

Code:

package javaProgram;

import java.util.*;

public class Main {
  
   static boolean isSquare(double[][] arr_2D) {
       boolean flag=false;
       if(arr_2D.length==arr_2D[0].length) {
           flag=true;
       }
       return flag;
   }
  
   public static void main(String []args) {
       double arr_2D[][]= {{1,2,3},{1,4},{4,5,6}};
       if(isSquare(arr_2D)==true)
           System.out.println("The given array is Square Matrix");
      
   }
}

------------------------------------------

Screenshot:

0 Main.java X 1 package javaProgram; Console X <terminated> Main (5) [Java Application) C: The given array is Square Matrix 2 3 import java.util.*; 4 5 public class Main { 6 static boolean isSquare (double[][] arr_2D) { boolean flag=false; if(arr_2D. length==arr_2D[0].length) { flag=true; } return flag; } 70 8 9 10 11 12 13 14 150 16 17 18 19 20 21 } 22 public static void main(String []args) { double arr_2D[][]= {{1,2,3},{1,4},{4,5,6}}; if(isSquare(arr_2D)==true) System.out.println("The given array is Square Matrix");

Answer e:

Code:

package javaProgram;

import java.util.*;

public class Main {
  
   static boolean isEqual(int[] A,int[] B) {
       boolean flag=false;
       if(A.length==B.length) {
           for(int i=0;i<A.length;i++) {
               if(A[i]==B[i])
                   flag=true;
           }
       }
       return flag;
   }
  
   public static void main(String []args) {
       int[] A= {1,2,3};
       int[] B= {1,2,3};
       if(isEqual(A,B)==true)
           System.out.println("Value in two array are equal");
       else
           System.out.println("Value in two array are not equal");
   }
}
----------------------------------

Screenshot of output:

U Console X X <terminated> Main (5) [Java Applicatio Value in two array are equal Main.java X 1 package javaProgram; 2 3 import java.util.*; 4 5 public class Main { 6 70 static boolean isEqual(int[] a, int[] B) { boolean flag=false; 9 if(A.length==B. length) { 10 for(int i=0;i<A.length;i++) { 11 if(A[i]==B[i]) { 12 flag=true; 13 } } } return flag; } 14 15 16 17 18 190 20 21 22 23 24 25 26 27 } 28 public static void main(String []args) { int[] A= {1,2,3}; //let value of A is 1,2,3 int[] B= {1,2,3}; //let value of is 1,2,3 if(isEqual (A,B)==true) System.out.println("Value in two array are equal"); else System.out.println("Value in two array are not equal"); }

If values of two arrays are not equal:

Main.java X 1 package javaProgram; 2 3 import java.util.*; Console X <terminated> Main (5) [Java Application) Value in two array are not equal 4 5 public class Main { 6 7 static boolean isEqual(int[] a, int[] B) { 8 boolean flag=false; 9 if(A.length==B.length) { 10 for(int i=0;i<A.length;i++) { 11 if(A[i]==B[i]) { flag=true; 13 14 15 } 16 return flag:) 17 } 12 } 18 190 20 21 22 public static void main(String []args) { int[] A= {2,3,4,5}; //let value of A is 2,3,4,5 int[] B= {1,2,3,4}; //let value of B is 1,2,3,4 if(isEqual (A,B)==true) System.out.println("Value in two array are equal"); else System.out.println("Value in two array are not equal"); } 23 24 25 26 27 } 28