Using the switch-case statement, write a menu driven program to do the following:
(a) To generate and print Letters from A to Z and their Unicode
| Letters | Unicode |
|---|---|
| A | 65 |
| B | 66 |
| . | . |
| . | . |
| . | . |
| Z | 90 |
(b) Display the following pattern using iteration (looping) statement:
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
import java.util.Scanner;
public class RAnsariSwitchCase
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("Enter 1 for letters and Unicode");
System.out.println("Enter 2 to display the pattern");
System.out.print("Enter your choice: ");
int ch = in.nextInt();
switch(ch) {
case 1:
System.out.println("Letters\tUnicode");
for (int i = 65; i <= 90; i++)
System.out.println((char)i + "\t" + i);
break;
case 2:
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= i; j++)
System.out.print(j + " ");
System.out.println();
}
break;
default:
System.out.println("Wrong choice");
break;
}
}
}Enter 1 for letters and Unicode
Enter 2 to display the pattern
Enter your choice: 1
Letters Unicode
A 65
B 66
C 67
D 68
E 69
F 70
G 71
H 72
I 73
J 74
K 75
L 76
M 77
N 78
O 79
P 80
Q 81
R 82
S 83
T 84
U 85
V 86
W 87
X 88
Y 89
Z 90
Press any key to continue . . .
First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.