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

A tech number has even number of digits. If the number is split in two equal halves, then the square of sum of these halves is equal to the number itself. Write a program to generate and print all four-digit tech numbers.

Example :
Consider the number 3025
Square of sum of the halves of 3025 = (30+25)²
= (55)²
= 3025 is a tech number.

String x[] = {“SAMSUNG”, “NOKIA”, “SONY”, “MICROMAX”, “BLACKBERRY”};

Give the output of the following statements:

1. System.out.println(x[1]);
2. System.out.println(x[3].length()); 

Differentiate between constructor and function.

Write the output for the following :

String s= “Today is Test”;
System.out.println(s.indexOf(‘T’)); System.out.println(s.substring(0, 7) + ” ” + “Holiday”);

Define Encapsulation.

 Define abstraction.

What is the function of catch block in exception handling? Where does it appear in a program?

State the output when the following program segment is executed:

String a = "Smartphone", b = "Graphic Art"; 
String h = a.substring(2, 5); 
String k = b.substring(S).toUpperCase(); 
System.out.println(h); 
System.out.println(k.equalsignoreCase(h)); 

Write the output for the following :

System.out.printIn(“Incredible” + “\n” + “world”);

If int y = 10 then find int z = (++y * (y++ +5));

Design a class to overload a function Joystring( )as follows:

(i) void Joystring (String s, char ch1 char ch2) with one string argument and two character arguments that replaces the character argument ch1 with the character argument ch2 in the given string s and prints the new string.
Example:
Input value of s = “TECHNALAGY”
ch1=‘A’,
ch2=‘O’
Output: TECHNOLOGY
(ii) void Joystring (String s) with one string argument that prints the position of the first space and the last space of the given string s.
Example:
Input value of = “Cloud computing means Internet based computing”
Output: First index: 5
Last index: 36
(iii) void Joystring (String s1, String s2) with two string arguments that combines the two string with a space between them and prints the resultant string. Example :
Input value of s1 =“COMMON WEALTH”
Input value of s2 =“GAMES”
Output: COMMON WEALTH GAMES
(use library functions)

State the output of the following program segment:
String str1 = “great”; String str2 = “minds”;
System.out.println (str1.substring (0,2).concat(str2.substring (1)));
System.out.println ((“WH”+(str1.substring (2).toUpperCase())));

Rewrite the following program segment using if-else statements instead of the ternary operator: 
String grade = (mark >= 90) ? “A” : (mark >= 80) ? “B” : “C”;

Give the output of the following method:

public static void main (String [] args)
{
int a = 5;
a++;
System.out.println(a);
a -= (a--) − (--a); 
System.out.println(a);
}

State the value of characteristic and mantissa when the following code is executed:
String s = “4.3756”;
int n = s.indexOf(‘.’);
int characteristic=Integer.parseInt (s.substring (0,n));
int mantissa=Integer.valueOf(s.substring(n+1)); 

Define a class named movieMagic with the following description:
Instance variables/data members:
int year — to store the year of release of a movie.
String title — to-store the title of the movie

float rating — to store the popularity rating of the movie
(minimum rating=0.0 and maximum rating=5.0)

Member methods:
(i) movieMagic() Default constructor to initialize numeric data members to 0 and String data member to “ ”.
(ii) void accept() To input and store year, title and rating.
(iii) void display() To display the title of a movie and a message based on the rating as per the table below.

Write a main method to create an object of the class and call the above member methods.

Wrapper classes are available in ______ package.

A Identify the type of operator &&:

Evaluate the expression when x is 4:

x + = x + + * + + x %2; 

Define a class pin code and store the given pin codes in a single-dimensional array. Sort these pin codes in ascending order using the Selection Sort technique only. Display the sorted array.

110061, 110001, 110029, 110023, 110055, 110006, 110019, 110033