Operators

Operators perform mathematical or logical operations on values. In basic the operators are divided into four categories.

• Arithmetic
• Relational
• Logical
• Functional

 ARITHMETIC OPERATORS:

Numeric expressions contain operators that perform arithmetic operations such as addition, subtraction; multiplication etc. theses are called arithmetic operators. The following special symbols are used in Basic language.

Arithmetic Operators Table

RELATIONAL OPERATORS:

Relational operators are used to relate or compare two quantities. The result of comparison may be either Yes or No or may be True or False.

OPERATOR	RELATION	EXAMPLE
=	Equality	If A= 15 then stop.
< >	Inequality	If D$< > Sunday then display welcome.
<	Less than	If M<50 then print fail.
>	Greater than	If M>50 then print congratulation
< =	Less than or equal to	If K<=10 then go to step 70.
> =	Greater than or equal to	If G>=17 then X=x*2 otherwise, X= x*1.5

INPUT STATEMENT:

The input put assigning values to variable this statement allows to enter value of a variable while the program is running. The format of the input Statement is:

LINE# Input (Variable name)

Read----------Data Statements

The LET Statement assigns values from within a program and the input statement allows you to supply the values while the program is running. There is a third method using read and Data statements. This is useful when the data contains large numbers of values. A Data statement contains of the variable which are assigned to the respective variable names in Read statement. The format of Read and Data statements are:

Line# Read (1^st Variable name),(2^nd Variable name),…………..

Line #Data (Value of 1^st Variable), (Value of 2^nd Variable),……….

PRINT STATEMENT:

Print statement when executed, displays the processing results of the computer. Print Statement is similar to print command used in compiler mode. Print is followed by a line number such as:-

LINE#{……………………………..}

LET STATEMENT:

LET is an assignment statement that stores a value in a location assigned to a given variable. The general format of the LET statement is as follows:-

LINE# LET variable = expression

LOGICAL OPERATORS:

Logical Operators such as AND, OR, NOT, NAND, NOR, and XOR perform in the same way as in Booker algebra. The result of these logical operations would be either True or False.

For example an allowance of Rs. 1,000 is announced for employees under grade 12 of firms whose stuff members are more than 4. It may be expressed as:-

If G < 12 and MEM>4 then All= 1000

Excellent grade is awarded to students getting 80% or more marks or total marks 360 above. This can be expressed.

IF M> = 80 OR TOT>=360 Then GR$=Excellent

FUNCTIONAL OPERATORS:

Basic is very rich in having predetermined functions that perform arithmetic and string operations. These are built in functions such as ABS, INT, FIX, RND, SQR, LOG, SIN and COS.