introduction to computer and java

Question 08: What language does the CPU understand?

  ANS:  CPU understand only binary code or machine language. Because it is native language of computer.

Question 09: What is an assembly language?.What is an assembler?

Ans:  

      Assembly language:

                           Assembly language use short descriptions words called mnemonics which is used to represent machine instruction.

Example:

       For adding two numbers.           add 4,9 result

 Assembler:

            An assembler is a software that convert assembly language into machine code.

Question 10:   What is a high-level programming language?

  Ans:

          High level language is English like , Which is easy to understand.

The instruction given to computer is called a statement.

Example

            Sum  = a+b;

 Question 11:    What is a source program?

Ans:

         The program  written in high level language is called source program or source code.

Question 12:      What is an interpreter? What is a compiler?

    Interpreter.

                  An interpreter is a software that convert high level language in low level language statement by statement. It is time consuming

  Compiler:

                  A compiler is a software that convert high level into low level language as whole.

Question 13:     What is a keyword? List some Java keywords.

    Keywords are reserved words that have predefine meaning and purpose.

 Key words:byte ,  short ,  int ,  float ,  char , String  ,Boolean , etc.                

Question 14:   Show the output of the following code:

public class Test {

public static void main(String[] args) {

System.out.println("3.5 * 4 / 2 – 2.5 is ");

System.out.println(3.5 * 4 / 2 – 2.5);

}

}

Output

         3.5 * 4 / 2 – 2.5 is

         4. 5