switch-case statement
1.
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
SOLUTION
import java.util.Scanner;
class MenuDriven
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.println("1. Print Unicode Values");
System.out.println("2. Traingle
Pattern");
System.out.println("Please enter
your choice: ");
int choice = sc.nextInt();
switch(choice)
{
case 1:
System.out.println("Letters\t\tUnicode");
for(char p = 'A'; p <= 'Z'; p++)
{
System.out.println(p +
"\t" + (int)p);
}
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!");
}
}
}
NOTE: This
question is also a part of pattern section
2. Write a menu-driven program to
display the pattern as per user’s choice:
Pattern 1 Pattern
2
ABCDE B
ABCD LL
ABC UUU
AB EEEE
A
For an incorrect option, an
appropriate error message should be displayed.
SOLUTION
import java.util.Scanner;
public class MenuDriven
{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Please enter
your choice: 1. ABCDE pattern 2. BLUE pattern ");
int choice = sc.nextInt();
switch(choice)
{
case 1:
int rows=5;
for (int i = 1; i<=n; i++) {
int k=65;// 65 is the ASCII
code of capital A
for (int j = 1; j <=
(n-i+1); j++) {
System.out.print((char)k);//explicit typecasting
k++;
}
System.out.println();
}
break;
case 2:
String s = "BLUE";
for (int i = 0; i < s.length();
i++) {
char ch = s.charAt(i);
for (int j = 1; j <= (i +
1); j++) {
System.out.print(ch);
}
System.out.println();
}
break;
default:
System.out.println("Invalid
choice");
}
}
}
NOTE: This
question is also a part of pattern section
3.
Using
switch statement, write a menu-driven program for the following:
(i) To find and display the sum of the series given below:
S = x1 – x2 + x3 – x4
+ x5 … – x20, where x = 2.
(ii) To display the following series:
1 11 111 1111 11111
For an incorrect option, an appropriate error message should
be displayed
SOLUTION
import java.util.Scanner;
public class MenuDriven
{
public static void main(String[] args)
{
System.out.println("Please Enter your choice: ");
System.out.println("1. To Display Sum of series");
System.out.println("2. To
Display Series");
Scanner sc = new Scanner(System.in);
int choice = sc.nextInt();
switch (choice)
{
case 1:
double sum = 0.0,x=2.0;
for (int i = 1; i <= 20; i++)
{
if (i % 2 == 1)
{
sum = sum + Math.pow(x, i);
}
else
{
sum = sum - Math.pow(x, i);
}
}
System.out.println("Sum of series =
" + sum);
break;
case 2:
for (int i = 1; i <= 5; i++)
{
for (int j = 1; j <= i; j++)
{
System.out.print("1");
}
System.out.print(" "); //for
same line no sopln required
}
break;
default:
System.out.println("Wrong
choice");
break;
}
}
}
4.
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
(ii) To display the following pattern:
I
IC
ICS
ICSE
For an incorrect option, an appropriate error message should
be displayed.
SOLUTION
import java.util.Scanner;
class MenuDriven2016
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.println("Please Enter
your choice: ");
System.out.println("1. Floyd's
Triangle pattern");
System.out.print("2. ICSE
Pattern");
int ch = sc.nextInt();
switch(ch)
{
case 1:
int digit = 1;
for(int i = 1; i <= 5; i++){
for(int j = 1; j <= i; j++){
System.out.print(digit +
" ");
digit++;
}
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("Invalid
choice!");
}
}
}
NOTE: This
question is also a part of pattern section
5.
Using the switch
statement, write a menu-driven program to:
(i) To find and display all the factors of a number input by
the user (including 1 and excluding the number itself).
Example:
INPUT:
n = 15
OUTPUT:
1, 3, 5
(ii) To find and display the factorial of a number input by
the user. The factorial of a non-negative integer n, denoted by n!, is the
product of all integers less than or equal to n.
Example:
INPUT:
n = 5
OUTPUT:
5! = 1 × 2 × 3 × 4 × 5 = 120.
For an incorrect choice, an appropriate error message should
be displayed.
SOLUTION
import java.util.Scanner;
class MenuDriven2015
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.println("Please Enter
your choice: ");
System.out.println("1.
Factors");
System.out.println("2.
Factorial");
int ch = sc.nextInt();
switch(ch)
{
case 1:
System.out.print("Please enter
any Number: ");
int n = sc.nextInt();
for(int i = 1; i < n; i++)
{
if(n % i == 0)
System.out.print(i + "
");
}
break;
case 2:
System.out.print("Please enter
any Number: ");
n =sc.nextInt();
int fact = 1;
for(int i = 1; i <= n; i++)
fact *= i; //fact=fact*i;
System.out.println("factorial
is :" +fact);
break;
default:
System.out.println("Invalid
choice!");
}
}
}
6.
Using the
switch statement, write a menu-driven program to calculate the maturity amount
of a bank deposit.
The user is given the following options:
(i) Term Deposit
(ii) Recurring Deposit
For option (i) accept Principal (p), rate of interest (r)
and time period in years (n). Calculate and output the maturity amount (a)
receivable using the formula a = p[1 + r / 100]n.
For option (ii) accept monthly installment (p), rate of
interest (r) and time period in months (n). Calculate and output the maturity
amount (a) receivable using the formula a = p * n + p * n(n + 1) / 2 * r / 100
* 1 / 12.
For an incorrect option, an appropriate error message should
be displayed.
SOLUTION
import java.util.Scanner;
class MenuDriven2014
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.println("Please enter
your choice: ");
System.out.println("1. Term
Deposit");
System.out.println("2. Recurring
Deposit");
double a=0,p=0,r=0,n=0;
int ch = sc.nextInt();
switch(ch)
{
case 1:
System.out.println("Please
Enter Principal: ");
p = sc.nextDouble();
System.out.println("Please
enter rate of interest: ");
r = sc.nextDouble();
System.out.println("Please
enter time in years: ");
n = sc.nextDouble();
a = p * Math.pow(1 + r / 100, n);
System.out.println("Maturity
amount is " + a);
break;
case 2:
System.out.println("Please
enter Monthly installment: ");
p =
sc.nextDouble();
System.out.println("Please
enter Rate of interest: ");
r =
sc.nextDouble();
System.out.println("Please
enter Time in months: ");
n =
sc.nextDouble();
a = p * n + p * (n * (n + 1) / 2) *
(r / 100) * (1.0 / 12);
System.out.println("Maturity amount
is " + a);
break;
default:
System.out.println("Invalid
input");
}
}
}
7.
Using the
switch statement, write a menu-driven program:
(i) To check and display whether a number input by the user
is a composite number or not. (A number
is said to be composite if it has one or more than one factor excluding 1 and
the number itself.). Example: 4, 6, 8, 9, …
(ii) To find the smallest digit of an integer that is input:
Sample Input: 6524
Output: Smallest digit is 2.
For an incorrect choice, an appropriate error message should
be displayed.
SOLUTION
import java.util.Scanner;
class MenuDriven
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.println("Please enter
your choice: ");
System.out.println("1. Composite
Number");
System.out.println("2. Smallest
Digit");
int n=0;
int ch = sc.nextInt();
switch(ch){
case 1:
System.out.print("Please enter
any number ");
n = sc.nextInt();
int c = 0;
for(int i = 1; i <= n; i++){
if(n % i == 0)
c++;
}
if(c > 2)
System.out.println(n + "
is a composite number");
else
System.out.println(n + "
is not a composite number");
break;
case 2:
System.out.print("Please enter
any number: ");
n = sc.nextInt();
int min = n % 10;
for(int i = n; i>0;i=i/10)
{
int r = i % 10;
if(min > r)
min = r;
}
System.out.println(min + " is
the smallest digit");
break;
default:
System.out.println("Invalid
choice!");
}
}
}
8.
Using the
switch statement, write a menu-driven program to:
(i) Generate and display the first 10 terms of the Fibonacci
series 0, 1, 1, 2, 3, 5, …
The first two Fibonacci numbers are 0 and 1, and each
subsequent number is the sum of the previous two.
(ii) Find the sum of the digits of an integer that is input.
Sample Input: 15390
Sample Output: Sum of the digits = 18.
For an incorrect choice, an appropriate error message should
be displayed.
SOLUTION
import java.util.Scanner;
class MenuDriven2012
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.print("Please Enter
your choice: ");
System.out.println("1. First 10
Fibonacci terms");
System.out.println("2. Sum of the
digits");
int ch = sc.nextInt();
switch(ch){
case 1:
int a = 0;
int b = 1;
System.out.print(a + " "
+ b);
for(int i = 3; i <= 10; i++){
c=a+b;
System.out.print(" "
+ c);
a = b;
b = c;
}
break;
case 2:
System.out.print("Please enter
any digit: ");
int n = sc.nextInt();
int sum = 0,r=0;
for(if i=n;i>0;i=i/10)
{
r=i%10;
sum=sum+r;
}
System.out.println("Sum of the
digits: " + sum);
break;
default:
System.out.println("Invalid
choice!");
}
}
}
9.
Write a
menu-driven program to perform the following (use switch case statement):
(a) To print the series 0, 3 7, 15, 24, … n terms (value of
‘n’ is to be an input by the user)
(b) To find the sum of the series given below: S = 1 / 2 + 3
/ 4 + 5 / 6 + 7 / 8 + … + 19 / 20.
SOLUTION
import java.util.Scanner;
class MenuDriven2011{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.print("Please Enter
your choice: ");
System.out.println("1.
to ptint series 1");
System.out.println("2. To
calculate sum of given series 2");
System.out.print("Enter your
choice: ");
int ch = sc.nextInt();
switch(ch)
{
case 1:
System.out.print("Please enter any
value ");
int n = sc.nextInt();
for(int i = 1; i <= n; i++)
System.out.print((i * i - 1) +
" ");
break;
case 2:
double sum = 0.0;
for(double i = 1; i <= 19; i++)
sum = sum + i / (i + 1);
System.out.print("Sum of the
series is " + sum);
break;
default:
System.out.println("Invalid
choice!");
}
}
}
10.
Write a
menu-driven program to accept a number and check and display whether it is a
prime number or not, or an automorphic number or not. Use switch-case
statement.
(a) Prime number: A number is said to be a prime number if
it is divisible only by 1 and itself and not by any other number.
Example: 3, 5, 7, 11, 13, etc.
(b) Automorphic number: An automorphic number is the number
which is contained in the last digit(s) of its square.
Example: 25 is an automorphic number as its square is 625
and 25 is present as the last two digits.
SOLUTION
import java.util.Scanner;
class MenuDriven2010
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.println("ENTER YOUR
CHOICE");
System.out.println("1. Prime
Number");
System.out.println("2. Automorphic
Number");
int n=0,count=0;
int ch = sc.nextInt();
switch(ch){
case 1:
System.out.println("Enter any
value ");
n = sc.nextInt();
count = 0;
for(int i = 1; i <= n; i++)
{
if(n % i == 0)
count++;
}
if(count == 2)
System.out.println(n + "
is a prime number");
else
System.out.println(n + "
is not a prime number");
break;
case 2:
System.out.println("Enter any
value ");
n = sc.nextInt();
int square = n * n;
for(int i = n;i>0;i = i/10)
//Digit Counting
count++;
int last= square %
(int)Math.pow(10,count);//Extract last digits to check
if(last==n)
System.out.println(n + " is an
automorphic number");
else
System.out.println(n + "
is not an automorphic number");
break;
default:
System.out.println("Wrong
choice");
}
}
}
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