Using the switch statement, write a menu driven program for the following:
(i) To print the Floyd’s triangle [Given below]
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
(b) 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.
import java.util.Scanner;
public class RAnsariPattern
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("Type 1 for Floyd's triangle");
System.out.println("Type 2 for an ICSE pattern");
System.out.print("Enter your choice: ");
int ch = in.nextInt();
switch (ch) {
case 1:
int a = 1;
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(a++ + "\t");
}
System.out.println();
}
break;
case 2:
String s = "ICSE";
for (int i = 0; i < s.length(); i++) {
for (int j = 0; j <= i; j++) {
System.out.print(s.charAt(j) + " ");
}
System.out.println();
}
break;
default:
System.out.println("Incorrect Choice");
}
}
}Type 1 for Floyd's triangle
Type 2 for an ICSE pattern
Enter your choice: 1
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
Press any key to continue . . .
Type 1 for Floyd's triangle
Type 2 for an ICSE pattern
Enter your choice: 2
I
I C
I C S
I C S E
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.