Page 106 - ComputerScience_Class_11

Let us consider a program to print the quotient of two numbers.
void calculate(int a, int b)
{
double q;
q = a/b;
System.out.println("quotient : "+q);
}

Note: If we take 0 in b and as we know that we cannot divide anything by 0, so a runtime error will occur.

Let’s Revisit

♦ Java is a third-generation object-oriented programming language.

♦ Low-level languages are machine-oriented and require extensive knowledge of computer hardware and its configuration.
♦ Data abstraction is the property by which the essential features of a class are represented without knowing the background
details that how it is actually executing, i.e., non-essential units are hidden from the user.
♦ Inheritance is the method which allows one class to inherit the properties (data members and member methods) of another class.
♦ Polymorphism is the feature of being able to allot a dissimilar meaning so that a variable, a method or an object can have more
than one form.
♦ Java standalone applications can run independently on an individual computer.
♦ Java applets are the small Java programs that are implanted in an HTML page and execute only within any web browser.

MIND DRILL

Solved Questions

A. Tick ( ) the correct option.
1. Java was officially released in ………………… .
a. 1991 b. 1995
c. 1997 d. 2020
2. Which of the following types of errors occur during the execution of a successfully compiled program?
a. Logical errors b. Runtime errors
c. Syntax errors d. None of these
3. Java is a programming language that uses ………………… .
a. Procedure-oriented technology b. Object-oriented technology
c. Both a and b d. Machine-level programming
4. Which of the following buttons is used to compile a program in BlueJ?
a. Compile b. Close
c. Paste d. None of these
5. A grammatical error while coding leads to a ………………… .
a. Logical error b. Runtime error
c. Syntax error d. Compilation error

Answers
1. b 2. b 3. b 4. a 5. c

104 Touchpad Computer Science (Ver. 3.0)-XI