GW BASIC VIVA VOCE

Q: 1: What does BASIC means?

Ans: BASIC  is the abbreviation of  Beginner’s All-Purpose Symbolic Instruction Code. It is a language which was invented to teach students a fundamental concept of programming.

Q: 2: Who invented the BASIC Language?

Ans: In 1963 two Americans John Kemeny and Thomas Kurtz developed BASIC (Beginner’s All-Purpose Symbolic Instruction Code) language for computers at Darmouth College.

Q: 3: What are the basic rules of a GW-BASIC program?

Every GW-BASIC program should have the following rules:

1-Every program statement must begin with line number.

2-Every program should end with an END statement.

3-There should be no repetition of lines.

4-Every statement should be separated by (: ) colon.

Q:4 : How many types of variables are used in GW-BASIC?

Ans: Two types of variables are used in GW-BASIC. They are called Numeric Variables and String Variables.

Q: 5: What are Numeric Variables?

Ans: Numeric Variables are those variables that can store numeric values.

Q: 6: What are String Variables?

Ans: String Variables are those variables that can store sequence of characters.

Q: 7: What is a  constant ?

Ans: A Constant is a quantity whose value cannot be changed; it cannot be changed like a Variable. There are Numeric Constants and String Constants.

Q:8: What is a Numeric Constant?

Ans: Numeric Constant consists of integers, single-precision or double- precision numbers.

Q: 9: What is a String Constant?

Ans: A String Constant is a sequence of alphanumeric characters enclosed in double quotation marks. The maximum length of a String Constant is 255 characters.

Q: 10: What is a Direct Mode?

Ans: When GW-BASIC is loaded, it shows OKmessage, it is in Direct Mode. In this mode GW-BASIC commands are executed as they are typed. Results are displayed immediately but the commands themselves are lost after execution

Q: 11: What is an Indirect Mode?

Ans: The Indirect mode is used to type the programs. The program loaded in memory is executed by entering RUN command.

Q: What is a Flow Chart?

Ans: Flowchart is the pictorial representation of an algorithm. We can present the flow of data in visual form with a Flowchart. The following symbols are used in a Flow chart.

Q: 12: What is an Algorithm?

Ans: An Algorithm is a finite set of steps which, if followed, accomplish a particular task.

Q: 13: What are logical errors?

Ans:  Such errors are called Logical Errors that are caused in a program due to improper use of symbols and date or wrong use of formula.

Q:14: What are Syntax Errors?

Ans:  Such errors that arise due to limitation of computer are called Syntax Errors. 

Q:15: What is a Loop?

Ans:  Loop is a technique to execute a set of statements repeatedly.

Q: 16: What is an array?

Ans:   Such collection of contiguous memory collections is called array which can store data of same type.

Q:17:  What is a pixel?

Ans:  A tiny dot that is used to represent a picture is called a pixel.

Q:18: What are reserved words or Key words?

Ans: IN GW-BASIC some words have fixed meanings and cannot be used as a variable, such words are called Key Words or reserved Words. Such as, IF, THEN, NEXT, FOR.

Q:19: What is the use of REM statement?

Ans:  We use REM statement to add remarks in our GW-BASIC programs.

Q: 20: What is a Screen statement?

Ans: In GW-BASIC programming Screen statement is used to change the text mode into graphic mode or to change graphic mode into text mode.