(English Medium) ICSE Class 10 - CISCE Important Questions for Computer Applications

What is meant by a package? 

Name any two basic principles of Object-oriented Programming.

Name any two OOP’s principles.

What are identifiers?

What are keywords ? Give an example.

Name the type of error ( syntax, runtime or logical error) in each case given below: 

(i) Math.sqrt (36 – 45)
(ii) int a;b;c;

Write a function prototype of the following: 

A function PosChar which takes a string argument and a character argument and returns an integer value.

Give the output of the following expression:
a+= a++ + ++a + -- a + a--; when a = 7;

Using the switch statement, write a menu-driven program for the following: 

(i) To print 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

I     C

I     C      S

I     C      S     E

For an incorrect option, an appropriate error message should be displayed. 

Which of the following are valid comments ?

(i) /* comment */
(ii) /* comment
(iii) / / comment
(iv) */ comment */ 

Give two differences between the switch statement and the If-else statement.

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

Consider the given program and answer the questions given below:

class temp
      {
      int a;
      temp()
      {
      a=10
      }
      temp(int z)
      a=z;
      }
      void print()
      {
      System.out.println(a);
      }
      void main()
      {
      temp t = new temp();
      temp x = new temp(30);
      t.print();
      x.print();
      }
      }
  

1. What concept of OOPs is depicted in the above program with two constructors?
2. What is the output of the method main()?

Write the memory capacity (storage size) of short and float data type in bytes.

Differentiate between if else if and switch-case statements.

Give the output of the following code:

String P = “20”, Q = “19”,
int a = Integer .parselnt(P);
int b = Integer. valueOf(Q);
System.out.println(a+””+b);

State the data type and value of res after the following is executed :

char ch = ‘9’;
res = Character. isDigit(ch)

State the number of bytes occupied by char and int data types.

State the data type and value of res after the following is executed:
char ch = ‘t’;
res=Character. toUpperCase(ch);

Why is an object called an instance of a class?