Answer:
Explanation:
import java.util.Scanner;
public class Menu {
public static void main(String[] args) {
/*
* Creating an Scanner class object which is used to get the inputs
* entered by the user
*/
Scanner sc = new Scanner(System.in);
int choice;
do
{
System.out.println("\n::MENU::");
System.out.println("1.Echo Name");
System.out.println("2.Double Your Age");
System.out.println("3.Check Teenager or not");
System.out.println("4.Display Triangle");
System.out.println("5.Exit");
System.out.print("Enter Choice:");
choice = sc.nextInt();
switch (choice) {
case 1: {
System.out.print("Enter your name");
String name=sc.nextLine();
for(int i=1;i<=20;i++)
{
System.out.println(name);
}
break;
}
case 2: {
int age;
System.out.print("Enter age :");
age=sc.nextInt();
System.out.println("Your age :"+age);
System.out.println("Doubled age :"+(2*age));
break;
}
case 3: {
int age;
System.out.print("Enter age :");
age=sc.nextInt();
if(age>=13 && age<=19)
{
System.out.println("Since you are "+age+" years old.Your are a Teenager");
}
else
{
System.out.println("Since you are "+age+" years old.Your are not a Teenager");
}
break;
}
case 4: {
int rows;
do
{
System.out.print("Enter a number (between 3 and 50):");
rows=sc.nextInt();
if(rows<3 || rows>50)
{
System.out.println("** Invalid.Must be between 3 and 50 **");
}
}while(rows<3 || rows>50);
printTriangle(rows);
break;
}
case 5:{
break;
}
default: {
System.out.println("** Invalid Choice **");
break;
}
}
}while(choice!=5);
}
private static void printTriangle(int size) {
char ch='*';
for (int a = 0; a < 2 * size - 1; a++) {
if (a % 2 == 0) {
for (int b = 0; b < (2 * size - 1) - a; b++) {
System.out.print(" ");
}
for (int c = 0; c <= a; c++) {
System.out.print(ch+" ");
}
System.out.println();
}
}
}
}
___________________________
Output:
::MENU::
1.Echo Name
2.Double Your Age
3.Check Teenager or not
4.Display Triangle
5.Exit
Enter Choice:1
Enter your name: Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
Mirian
::MENU::
1.Echo Name
2.Double Your Age
3.Check Teenager or not
4.Display Triangle
5.Exit
Enter Choice:2
Enter age :23
Your age :23
Doubled age :46
::MENU::
1.Echo Name
2.Double Your Age
3.Check Teenager or not
4.Display Triangle
5.Exit
Enter Choice:3
Enter age :16
Since you are 16 years old.Your are a Teenager
::MENU::
1.Echo Name
2.Double Your Age
3.Check Teenager or not
4.Display Triangle
5.Exit
Enter Choice:4
Enter a number (between 3 and 50):6
*
* * *
* * * * *
* * * * * * *
* * * * * * * * *
* * * * * * * * * * *
::MENU::
1.Echo Name
2.Double Your Age
3.Check Teenager or not
4.Display Triangle
5.Exit
Enter Choice:5
