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By Peter C. Sanderson
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Additional resources for Interactive Computing in BASIC. An Introduction to Interactive Computing and a Practical Course in the BASIC Language
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The arithmetic operators for operations other than addition and subtraction are given below. 55 56 How to Write Simple Arithmetical Programs in BASIC * Multiply / Divide t raise to a power (exponentiate) The exponentiate symbol is sometimes written as **. g. 5*X - 3 LETE=4*A*C LET L = A/2 LET R = 192 - P t l . 5* - 3) (e = 4ac) (l=a/2) 1 5 ( r = 192-p * + / ) It is important (even for experienced programmers) to remember that operators (especially*) are never implicit and must always be written.
An expression in brackets is treated as a single variable or constant in so far as it cannot be next to another variable, constant or bracketed expression without an operator in between. 860 LET F = 3 (A+B) is incorrect and should be rewritten as 860 LET F = 3*(A+B) Brackets can be nested to any depth within an arithmetic expression. Redundant brackets are ignored by the compiler so that if in doubt as to the order of evaluation of a complicated expression (which is described below) you should use brackets to clarify matters.
5. The language should be independent of the hardware individualities or operating system of a specific computer so that programs can be readily transferred from one computer to another. Standard versions of FORTRAN and COBOL sponsored by the American National Standards Institution have been recently implemented for many computers in common use. There are however many "dialects" of common computer languages including BASIC in existence which extend the scope of the languages or enable them to utilise the hardware excellencies of a specific computer but which have the disadvantage of limiting the use of programs using these extensions to a single type of computer.