Question

Using the switch statement, write a menu-driven program for the following: 

(i) To print Floyd’s triangle [Given below]

1

2      3

4      5       6

7      8       9      10

11    12    13     14    15

(ii) To display the following pattern:

I

I     C

I     C      S

I     C      S     E

For an incorrect option, an appropriate error message should be displayed. 

Answer 1

(i)

import java.util.Scanner;
class  pattern
{
public static void main ()
{
Scanner sc = new Scanner (System. in);
System.out.println("1. Pattern 1 \n 2. pattern 2");
System.out.println ("Enter choice");
int c = sc.nextInt ();
switch (c)
{
       case 1 :
       int a, b, c = 1;
       for (a = 1; a < = 5; a++)
{
         for (b = 1; b < = a; b++)
         {
              System.out.print (c);
              C++;
         }
        System.out.ptintln ();
}
break:

(ii)

String s = "ICSE"; int I = s.length();
for (int i = 0; i < I; i++)
{
        for (int j = 0; j < = i; j++)
        {
               System.out.print (s.charAt(j)),
        }
        System.out.println ();
}
break;
default:
System.out.println ("Invalid choice");
     }
   }
}

Answer 2

import java.util.*;
public class Q11{
public static void main(String ag[])
{Scanner ob = new Scanner(System.in);
int p = 1, i, j;
char ch;
System.out.println("***Menu Driven Program using if-else***");
System.out.println("Enter 'a' to Print Floyd's triangle");
System.out.println("Enter 'b' to print the pattern of the word ICSE");
System.out.println("Enter your choice");
ch = ob.next().charAt(0);
System.out.println();
if (ch == 'a' || ch == 'A') 
              {
              for (i = 1; i <= 5; i++)
              {for (j = i; j <= i; j++)
              System.out.print(p++ + "\t");
              System.out.println();
              }
}
else if (ch =='b' || ch == "B")
              {
              String s = "ICSE";
              for (i = 0; i <= 3; i++)
              { for (j = 0; j <= i; j++)
              System.out.print(s.charAt(j) + " ");
              System.out.println();
}}}}