Keywords are specific words that are reserved as programming language commands. This words may only be used for their intended purpose some of the keywords of QBASIC programming are REM, INPUT, PRINT etc.
Variable refers to a storage area whose contents can vary during processing. All the variables are created in the memory of the computer. The data store can change during the execution of the programs. Two example of variable are as follows. i) preetam2 ii) preetam$
Arithmetic operator are used for various mathematical calculation . Arithmetic operators performed such as addition, subtraction, multiplication, division and exponentiation. A numeric expression is any collection of operators and operands. Two example of arithmetic operators are + and -.
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