Page 186 - CA_Blue( J )_Class10
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B. Fill in the blanks.
1. To find all the even numbers from 2 to 20, the loop will execute for ………………… times.
2. In for loop, i<=10 is known as ………………….
3. i++ in while loop is known as ………………….
4. To print the sum of 10 natural numbers using loop, System.out.print(sum) statements should be written ………………… the loop.
5. If i = 1, then the loop while(i < 5) {i++} will execute ………………… times.
C. Answer the following questions:
1. Write the programs in Java to display the following series.
a. 1 2 3 4 5 ….. 10 b. 1 3 5 7 9 ….. 19
c. 0 3 8 15 …… 99 d. 5 10 15 20 … 50
e. 1 2 3 , ... 10 , f. 2 4 6 10 ,
,, ,...
,
,
3 6 9 30 4 6 8 12
2. Write the Java programs to calculated the result of the following series:
a. s=1+2+3+4+5…..+20 b. p=1*3*5*7*9
c. s=1+11+111+1111+11111 d. p=2*4*8*16*32
... 10
++
++
e. s=1+(1*2)+(1*2*3)+(1*2*3*4)+ (1*2*3*4*5) f. s= 1 + 1 + 2 + 12 3 + ... + 123 +
1
12
*
12
** ... * 10
123
** 3
9
g. p= 1 * 2 * 3 4 * ... * 10
3
2
3. Write a program in Java to input two numbers and print the LCM of the numbers.
4. Write a program to input a number and print the digits separated by comma (,) in reverse order.
Example: n=3456
Output: 6,5,4,3,
5. Write a program in Java to input a number and print the sum of the even digits and product of the odd digits.
Example: n = 23785
Output: Sum of the even digits is: 10
Product of the odd digits is: 105
6. Write a program to print the result of the following series where the unknown values are to be accepted by user.
3
4
1
2
2
2
a. a + a + a + a + …… + a b. s = x + 2x + 3x + …. + nx 2
n
2
1
2
c. p= 1 * 2 *3 ….n n d. s= 1 + 1 + 1 + ... + 1
3
2 4 6 10
1 1 1 1 a a a a
e. s= !2 + !4 + !6 + ... + !10 f. 2 * 4 * 6 *...* 10
1
4
5
2
3
g. s=a -a +a -a +a …a n h. p=(x+1)*(x+3)*(x+5)*….*(x+n)
7. Write a program to input a number and print whether the number is a Niven number or not. A Niven number which is divisible
by the sum of the digits. Example: 111 because 1+1+1= 3, and 111 is divisible by 3.
8. Write a program to input a number and check whether it is an Automorphic number or not. A number is Automorphic if the
square of the number ends in the same digits as the original number.
Example: 76 = 762 = 5776, so last 2 digits 76 is same as the original number.
9. Write a program to input a number and print whether the number is Krishnamurthy number or not. A Krishnamurthy number is
a number whose sum of the factorial of digits is equal to the number itself.
Example: 145, 1! + 4! + 5! = 1 + (1x2x3x4) + (1x2x3x4x5) = 1 + 24 + 120 = 145.
10. Write a program to input a number and print whether the number is a spy number or not. A spy number is a number whose sum
of the digits and product of the digits are equal. Example: 1124, sum: 1+1+2+4 = 8 and product: 1x1x2x4 = 8.
11. Write a menu-driven program to accept a number and print the number as a perfect number or trimorphic number according to
the user’s choice.
a. Perfect Number: A number that is equal to the sum of the proper divisors of the number. Example: 6 = 1+2+3 = 6
b. Trimorphic Number: A Trimorphic number is a number whose square ends in the same digits as the original number. Example:
24 = 24 x 24 = 13824
12. Write a menu-driven program to print the following series according to the user’s choice using the switch case statement.
a. s=1 + 12 + 123 + 1234+ 12345. b. p= 1 * 2 * 3 *... * nth term
1 4 9
184184 Touchpad Computer Applications-X

