(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Computer Applications

Name the two types of constructors.

Write the output of the following program code:

char ch ;
int x=97;
do
{
ch=(char) x;
System.out.print(ch + “ ” );
if(x%10 == 0)
break;
++x;
}while(x<=100);

Write a program to accept a number and check and display whether it is a Niven number or not. 
(Niven number is that number which is divisible by its sum of digits).
Example:
Consider the number 126.
The Sum of its digits is 1+2+6 = 9 and 126 is divisible by 9.

Write a program to accept a name and total marks of N number of students in two single subscript array name[] and totalmarks[].

Calculate and print:

1. The average of the total marks obtained by N Number of students.
   [average = (sum of total marks of all the students)/N]
2. Deviation of each student’s total marks with the average
   [deviation = total marks of a student – average] 

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 number itself).

Example:
Sample Input: n=15
Sample 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:
Sample Input: n=5
Sample Output: 5! = 1×2×3×4×5 = 120.
For an incorrect choice, an appropriate error message should be displayed.

State one difference between the floating point literals float and double.

Find the errors in the given program segment and re-write the statements correctly to assign values to an integer array.
int a = new int (5);
for (int i = 0; i < = 5; i++) a [i] = i;

What is the data type returned by the library function?
compareTo()

What will be the output when the following code segment is  executed?
String s = “1001”;
int x = Integer. valueOf(s);
double y = Double.valueOf(s);
System.out.println(“x=”+x);
System.out.println(“y=”+y); 

What will be the output when the following code segment is executed?

System.out.println(“The king said\”Begin at the beginning!\“to me.”);

Design a class to overload a function area( ) as follows:
(i) double area (double a, double b, double c) with three double arguments, returns the area of a scalene triangle using the formula:

area = `sqrt ("s" ("s" - "a")("s" - "b")("s" - "c"))  "2ab"`

where `"s" = ("a" + "b" + "c")/2`

(ii) double area (int a, int b, int height) with three integer arguments, returns the area of a trapezium using the formula:

area = `1/2` height (a+b)

(iii) double area (double diagonal 1, double diagonal 2) with two double arguments, returns the area of a rhombus using the formula :

area = `1/2` (diagonal 1 × diagonal 2)

Give the output of the following code.

String A = "26.0", B= "74.0";

double C = Double.parseDouble(A);

double D = Double.parseDouble(B);

System.out.println((C+D));

A mechanism where one class acquires the properties of another class:

Predict the output of the following code snippet: String P = "20", Q = "22";

int a = Integer.parseInt(P);

int b = Integer.value0f(Q);

System.out.println(a + " " + b);

Give the output of the following Character class method:

Character.toUpperCase('a')

Give the output of the following Character class method:

Character.isLetterOrDigit('W')

Consider the given array and answer the question given below:

int x[ ] {4; 7,9,66,72,0,16);

What is the length of the array?

Consider the given array and answer the question given below:

int x[ ] {4; 7,9,66,72,0,16);

What is the value in x[4]?

Write the value of n after execution:

char ch = 'd';
int n = ch + 5;

Define a class to accept 10 characters from a user. Using bubble sort technique arrange them in ascending order. Display the sorted array and original array.