More on "Understanding Basic Language "


This is a continuation from: Understanding Basic Language

Mathematical Operators
To carry out arithmetic operations in programming language, mathematical operators are used. Some of these operators are given below:

Operations        Operator
Addition               +
Subtraction           -
Multiplication       x
Division                /
Greater than          >
Lesser than           <
Exponential          ^
Non equal            <>

Expressions

An expression is something the interpreter calculates (or evaluates).
Some examples given below:
A = 24
B = 25
C = A + B (returns 49)

A = 120
B = 12
C = A / B (returns 10)

A = 34
B = 26
C = A - B (returns 8)


A = 200
B = 100
C = (A * 3) + B (returns 700)

A = 3
B = 2
C = A ^ B (returns 9)

 

Evaluate the following:


100 + 50/2 =
100 + 5 – 90 =
82 – (3 x 20 + 4) =
32 – 23 =
40 / 21 + (20 – 2) =

When the Basic Interpreter is loaded into the memory of the computer, the Basic Interface screen will open.


Type your first program:

10 PRINT “Welcome to the World of BASIC”

Press F2 to run the program. You will see the output as follows:

Press any key to return to the main screen.

Some Important Commands- A command tells the Basic Interpreter to perform a certain task.

PRINT: The PRINT command tells the Interpreter to print something on the screen. In the above case the interpreter prints – “Welcome to the World of Basic”.

Try the following examples

PRINT 5 + 10 * 2
25

PRINT “ROSE & LOTUS”
ROSE & LOTUS

PRINT “COMPUTER”
COMPUTER
                   
PRINT 3 ^ 2 * 5
45

PRINT “SACHIN”                                                 
SACHIN

PRINT “Rahul” ; “Dravid”
RahulDravid

PRINT “Rahul” , “Dravid”
Rahul Dravid
If a List of Instructions has to be given, line numbers will have to be used.

Try the following examples:

10 PRINT 100
20 END
RUN
100
OK

10 PRINT 15
20 PRINT 15 + 15
30 END
RUN
15
30
OK

10 PRINT “THE LOST”
20 PRINT “WORLD”
30 END
RUN
THE LOST
WORLD
OK

10 PRINT “ROHIT”
20 END
30 PRINT “RAM”
RUN
ROHIT
OK

END: The last statement of a program is END. END terminates the program. It means that the program is complete and the computer will ignore any line number given after the END statement.



POINTS TO REMEMBER
- PRINT statement displays anything written after it. It may be data or result.
- END statement is used to terminate the program.
- Once program is over, RUN command is given to execute the program.
- When a Computer has to do more than one calculation then it follows BODMAS Rule.

B à Brackets
O à Of
D à Division
M à Multiplication
A à Addition
S à Subtraction

State “True” or “False”
1) PRINT command cannot be given with line numbers.
2) For division we use “ / “ sign.
3) Non-Numeric data is displayed as it is.
4) The computer will ignore any line number given after END statement.
5) Non-Numeric information is written in double quotation marks.

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