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Operators

Operators

Operators are symbols that indicate the type of operation.

–      There are four types of operators in QBASIC.

1.      Arithmetic Operators,

2.      Relational Operators,

3.      Logical Operators

4.      String Operator.

 

1)  Arithmetic Operators

  • Arithmetic Operators are used to perform mathematical calculations
  • like addition, subtraction, division, multiplication and exponential.
  • The following table shows arithmetic operators used in QBASIC.
Operator Example output Operation
+ 2+2 4 addition
4-3 1 subtraction
* 2*2 4 multiplication
/ 10/2 5 division
^ 2^3 8 Exponential
Mod 11mod5 1 modular

 

2)  Relational Operators

  • Relational Operators are use to perform comparisons on two values of same type.
  • A comparison of sting data with numeric data cannot be done.
Operator Example Operation
= A= B Equal to
> A > B Greater Than
< A < B Less Than
>= A >= B Greater than or equal to
<= A <= B Less than or equal to
< > A < > B Not equal to

 

3)  Logical Operators

  • QBASIC supports logical operators to perform logical operations on numeric values.
  • Logical operators are used to connect two or more relations and return a TRUE or FALSE value to be used in a decision.
  • The commonly used logical operators in QBASIC are AND, OR and NOT.

AND Operator

AND operator returns ‘True’ when all the results returned from individual relational expressions are ‘True’ otherwise it returns ‘False’

Condition-1 Condition-1 Output
F T F
T F F
F F F
T T T

 

OR Operator

OR Operator return ‘True’ if any one  or both of the relational expressions returns ‘True’.

Condition-1 Condition-1 Output
F T T
T F T
F F F
T T T

 

NOT Operator

NOT Operator operates on one operand and returns ‘True’ if the logical operation returns ‘False’.

Operand Result
T F
F T

 

4)  String Operator

  • String Operator joins two or more than two sting.
  • The plus sign (+) is used join two string.
  • The result of combining two stings is called concatenation.
Operation Result
“Hello ” + “World” Hello World
“12”+”3” 123

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