Page 194 - CA_Blue( J )_Class10
P. 194
case 2:
str = "BLUE";
for(i = 0; i < str.length(); i++) {
ch1 = str.charAt(i);
for(j = 0; j <= i; j++)
System.out.print(ch1);
System.out.println();
}
break;
default:
System.out.println("Wrong Choice");
}
}
}
23. Write a program to accept a number and check and display whether it is a spy number or not. A number is spy if the sum of its
digits equals the product of its digits.
Example: Consider the number 1124.
Sum of the digits = 1 + 1 + 2 + 4 = 8.
Product of the digits = 1 × 1 × 2 × 4 = 8 [2017]
Ans. import java.util.*;
class Spy{
public static void main() {
Scanner sc= new Scanner(System.in);
int n,s=0,p=1,i,r;
System.out.print("Enter the number: ");
n = sc.nextInt();
i=n;
while(i>0) {
r = i % 10;
s=s+r;
p=p*r;
i=i/10;
}
if(s == p)
System.out.println(n+ " is Spy number.");
else
System.out.println(n+" is not spy number.");
}
}
24. Using the switch statement, write a menu-driven program for the following:
(i) To find and display the sum of the series given below:
3
4
1
2
5
20
S = x – x + x – x + x … – x , 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. [2017]
Ans. import java.util.*;
class series{
public static void main() {
Scanner sc= new Scanner(System.in);
int ch,i,p=0;
double s=0.0,x=2;
System.out.println("1. Series 1");
System.out.println("2. Series 2");
System.out.print("Enter your choice: ");
ch = sc.nextInt();
switch(ch) {
case 1:
for(i = 1; i <= 20; i++)
192192 Touchpad Computer Applications-X

