Below is my code. Can someone tell me what exactly is the problem in my code? I

Question

Below is my code. Can someone tell me what exactly is the problem in my code? I had tried different ways to change this and that, but it still not working. Thank you so much.

Here is an example of how the chart should look ;

                  ASCII Chart Using While-Loop:

32=   33=!  34="  35=#  36=$  37=%  38=&  39='

40=(  41=)  42=*  43=+  44=,  45=-  46=.  47=/

48=0  49=1  ...

.

.

.

etc. (to char 127)

**main

public class ASCII
{

   public static void main(String[] args)
   {
       Menus menu= new Menus();
       menu.userChoice();

   }

}

**Menus

import java.util.Scanner;

public class Menus
{
   Loops loop = new Loops();
  
   //This method take the user's input to decide loo[ to print, or to exit the program
   public void userChoice()
   {
       int choice;
       Scanner keyboard = new Scanner(System.in);
      
       do
       {
           System.out.println("Please selectfrom the following new options to see the printable");
           System.out.println("Characters of the ASCII chart using various loops, or select 0 to exit");
           System.out.println();
           System.out.println("1: For Loop");
           System.out.println("2: While Loop");
           System.out.println("3: Do-While Loop");
           System.out.println("0: Exit Program");
           choice = keyboard.nextInt();
          
           switch (choice)
           {
              case 1:
                   loop.forloop();
                  break;
              case 2:
                  loop.whileloop();
                  break;
              case 3:
                   loop.dowhileloop();
                  break;
              case 0:
                  System.out.println("Existing Program.");
                  break;       
                  
           default:
               System.out.println("Invalid choice, please try again.");
           }
           System.out.println();
          
           } while (choice != 0);
      
       keyboard.close();
          
          
       }
    } //end the switch choice

***loops

import java.util.Scanner;

public class Loops
{
   //This method print out the ASCII chart by using for loop
   public void forloop()
   {
       int i;
      
       System.out.println("The ASCII chart use a For Loop:");
       System.out.println();
      
       for (i=32;i<=127; i++)
       {
           System.out.printf("%3d = %-2c", i, (char)i);
           if (i % 10==0)
               System.out.println();
       }
       System.out.println();
   }
  
   //This method print out the ASCII chart using the while loop.
   public void whileloop()
   {
       int i=32;

       while (i<27)
       {
           i++;
           System.out.printf("%3d = %-2c", i, (char)i);
           if (i % 10==0)
               System.out.println();
       }
       System.out.println();
   }
   //This method will use do-while loop to print out the appropriate ASCII chart
   public void dowhileloop()
   {
       int i=32;
      
       do {
           i++;
           System.out.printf("%3d = %-2c", i, (char)i);
       }
       while (i<127);
       System.out.println();
       if (i % 7==0);
           System.out.println();
               }
}
   

Explanation / Answer

Loops.java

import java.util.Scanner;
public class Loops
{
//This method print out the ASCII chart by using for loop
public void forloop()
{
int i;
  
System.out.println("The ASCII chart use a For Loop:");
System.out.println();
  
for (i=32;i<=127; i++)
{
System.out.printf("%3d = %-2c", i, (char)i);
if (i % 10==0)
System.out.println();
}
System.out.println();
}
  
//This method print out the ASCII chart using the while loop.
public void whileloop()
{
int i=32;
while (i<=127)
{

System.out.printf("%3d = %-2c", i, (char)i);
if (i % 10==0)
System.out.println();
i++;
}
System.out.println();
}
//This method will use do-while loop to print out the appropriate ASCII chart
public void dowhileloop()
{
int i=32;
  
do {
System.out.printf("%3d = %-2c", i, (char)i);
if (i % 10==0)
System.out.println();
i++;
}
while (i<=127);
System.out.println();
if (i % 7==0);
System.out.println();
}
}

__________________________

Menus.java (Run this program to get the output.As it contains the main() method.)

import java.util.Scanner;

public class Menus {

   public static void main(String[] args) {
       //Create an object for Loops class Object
       Loops loop = new Loops();
      
       //Declaring variable
       int choice;
       //Scanner class Object is used to read the inputs entered by the user
       Scanner keyboard = new Scanner(System.in);
      
       //This loop continues to execute until the user chooses the option 0(Zero)
       do
       {
           //Displaying the menu
       System.out.println("Please selectfrom the following new options to see the printable");
       System.out.println("Characters of the ASCII chart using various loops, or select 0 to exit");
       System.out.println();
       System.out.println("1: For Loop");
       System.out.println("2: While Loop");
       System.out.println("3: Do-While Loop");
       System.out.println("0: Exit Program");
         
       //Getting the choice entered by the user
       System.out.print("Enter choice :");
       choice = keyboard.nextInt();
      
       //Based on the user's choice the corresponding case will get executed
       switch (choice)
       {
       //When the user chooses the choice then case 1 will get executed
       case 1:
       loop.forloop();
       break;
       //When the user chooses the choice then case 2 will get executed
       case 2:
       loop.whileloop();
       break;
       //When the user chooses the choice then case 3 will get executed
       case 3:
       loop.dowhileloop();
       break;
       //When the user chooses the choice then case 0 will get executed
       case 0:
       System.out.println("Existing Program.");
       break;   
       /* When the user enters a number other than 1 or 2 or 3 or 0
       * then default case will get executed
       */
       default:
       System.out.println("Invalid choice, please try again.");
       }
       System.out.println();
      
       } while (choice != 0);
      
       keyboard.close();
      

   }

}

______________________________

Output:

Please selectfrom the following new options to see the printable
Characters of the ASCII chart using various loops, or select 0 to exit

1: For Loop
2: While Loop
3: Do-While Loop
0: Exit Program
Enter choice :1
The ASCII chart use a For Loop:

32 = 33 = ! 34 = " 35 = # 36 = $ 37 = % 38 = & 39 = ' 40 = (
41 = ) 42 = * 43 = + 44 = , 45 = - 46 = . 47 = / 48 = 0 49 = 1 50 = 2
51 = 3 52 = 4 53 = 5 54 = 6 55 = 7 56 = 8 57 = 9 58 = : 59 = ; 60 = <
61 = = 62 = > 63 = ? 64 = @ 65 = A 66 = B 67 = C 68 = D 69 = E 70 = F
71 = G 72 = H 73 = I 74 = J 75 = K 76 = L 77 = M 78 = N 79 = O 80 = P
81 = Q 82 = R 83 = S 84 = T 85 = U 86 = V 87 = W 88 = X 89 = Y 90 = Z
91 = [ 92 = 93 = ] 94 = ^ 95 = _ 96 = ` 97 = a 98 = b 99 = c 100 = d
101 = e 102 = f 103 = g 104 = h 105 = i 106 = j 107 = k 108 = l 109 = m 110 = n
111 = o 112 = p 113 = q 114 = r 115 = s 116 = t 117 = u 118 = v 119 = w 120 = x
121 = y 122 = z 123 = { 124 = | 125 = } 126 = ~ 127 =

Please selectfrom the following new options to see the printable
Characters of the ASCII chart using various loops, or select 0 to exit

1: For Loop
2: While Loop
3: Do-While Loop
0: Exit Program
Enter choice :2
32 = 33 = ! 34 = " 35 = # 36 = $ 37 = % 38 = & 39 = ' 40 = (
41 = ) 42 = * 43 = + 44 = , 45 = - 46 = . 47 = / 48 = 0 49 = 1 50 = 2
51 = 3 52 = 4 53 = 5 54 = 6 55 = 7 56 = 8 57 = 9 58 = : 59 = ; 60 = <
61 = = 62 = > 63 = ? 64 = @ 65 = A 66 = B 67 = C 68 = D 69 = E 70 = F
71 = G 72 = H 73 = I 74 = J 75 = K 76 = L 77 = M 78 = N 79 = O 80 = P
81 = Q 82 = R 83 = S 84 = T 85 = U 86 = V 87 = W 88 = X 89 = Y 90 = Z
91 = [ 92 = 93 = ] 94 = ^ 95 = _ 96 = ` 97 = a 98 = b 99 = c 100 = d
101 = e 102 = f 103 = g 104 = h 105 = i 106 = j 107 = k 108 = l 109 = m 110 = n
111 = o 112 = p 113 = q 114 = r 115 = s 116 = t 117 = u 118 = v 119 = w 120 = x
121 = y 122 = z 123 = { 124 = | 125 = } 126 = ~ 127 =

Please selectfrom the following new options to see the printable
Characters of the ASCII chart using various loops, or select 0 to exit

1: For Loop
2: While Loop
3: Do-While Loop
0: Exit Program
Enter choice :3
32 = 33 = ! 34 = " 35 = # 36 = $ 37 = % 38 = & 39 = ' 40 = (
41 = ) 42 = * 43 = + 44 = , 45 = - 46 = . 47 = / 48 = 0 49 = 1 50 = 2
51 = 3 52 = 4 53 = 5 54 = 6 55 = 7 56 = 8 57 = 9 58 = : 59 = ; 60 = <
61 = = 62 = > 63 = ? 64 = @ 65 = A 66 = B 67 = C 68 = D 69 = E 70 = F
71 = G 72 = H 73 = I 74 = J 75 = K 76 = L 77 = M 78 = N 79 = O 80 = P
81 = Q 82 = R 83 = S 84 = T 85 = U 86 = V 87 = W 88 = X 89 = Y 90 = Z
91 = [ 92 = 93 = ] 94 = ^ 95 = _ 96 = ` 97 = a 98 = b 99 = c 100 = d
101 = e 102 = f 103 = g 104 = h 105 = i 106 = j 107 = k 108 = l 109 = m 110 = n
111 = o 112 = p 113 = q 114 = r 115 = s 116 = t 117 = u 118 = v 119 = w 120 = x
121 = y 122 = z 123 = { 124 = | 125 = } 126 = ~ 127 =

Please selectfrom the following new options to see the printable
Characters of the ASCII chart using various loops, or select 0 to exit

1: For Loop
2: While Loop
3: Do-While Loop
0: Exit Program
Enter choice :0
Existing Program.

______________Thank You

Related Questions

Navigate

• Browse (All)
• Browse B
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.