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BASIC comparison sheet ProgsVarsMem Page 7

Programs, Variables and Memory

Vendor

Model

Variables

Numeric range

String variables

String too long

String literals

Character set

Lower case

Arrays

String arrays

Array dimensions

Automatic DIM

Clear variables

Programs, Variables and Memory

HP TI Tandy Radio Shack Canon Epson

HP-75 HP-71 TI-74 CC-40 TRS-80 Mod. 100 X-07 HX-20

Default is REAL. Default is double precision. Default is single precision.

BCD, 13 digits, exponent range -128..+127.

ERR:Excess Chars E3 Mismatch LS Error

"String with 'quotes' ", 'String with "quotes" ' "String with ""quotes"" " "String", quotes inside string literals are not supported.

ASCII + symbols ASCII + symbols. National ASCII + symbols.

Yes Yes

Arrays of different types are independent from each other.

N/A

Arrays of dimension (10), (10,10) or (10,10,10) or more can be created implicitly by an assignment.

CLEAR VARS

N/A N/A N/A ERASE deletes selected arrays.

ERASE deletes selected arrays.

A-Z, A0-A9..Z0-Z9. Variables are independent but arrays and

simple variables cannot share the same name. Undefined

variables return 0.

Variables are local to the running program or procedure.

Long variable names, case insensitive, up to 15 chars,

@ and _ allowed. Variables may even start with a

keyword. Longer names result in error. All variables are

automatic and independent. Variables are created by a

manual assignment or automatically by RUN if used in a

program. Variables are created before the program is

executed, so all used variables are defined. Use of

undefined variables in command mode results in an

error.

Variables in procedures are local to the procedure but

can be made persistent between calls by

ATTACH <procedure>.

Two character variable names, case insensitive. Must not contain keyword. Longer

names are truncated. All variables are automatic and independent. Undefined

variables return 0.

Long variable names, case insensitive, up

to 32 chars. Must not start with keyword.

Longer names are truncated. All variables

are automatic and independent. Undefined

variables return 0.

REAL, SHORT and INTEGER declare variables with standard,

half or integer precision.

DEFDBL, DEFSGL, DEFINT <letter range> and suffixes #, ! and % allow double or single precision and 16 bit signed integers.

Variables of different types are independent from each other.

Default is double precision.

All float constants are double precision.

Like HP-71 but

not IEEE. SHORT

exponent range

+/-99.

BCD, 12 digits or 5 digits, exponent range

+/-499. Special values for NaN and Inf

(IEEE standard). Integers are BCD with 5

digits and no exponent. Some internal

computations use 15 digits.

Integer: 16 bit signed, -32768..32767.

Single precision: 32 bit binary float (ca.7 digits), exponent range -64..+62.

Double precision: 64 bit binary float (ca.14 digits), exponent range -64..+62.

Double precision numbers have a D exponent or a trailing #.

A$-Z$, A0$-A9$..Z0$-Z9$. DIM A$[L] sets string length to L.

Default is 32, maximum is memory dependent. String

allocation is static. String variables are independent but

arrays and simple variables cannot share the same name.

Undefined string variables return an empty string.

String variable names follow the rules of numeric

variables+$. String length is dynamic up to 255

characters. String variables are created by a manual

assignment or automatically by RUN if used in a

program. Use of undefined string variables results in an

error.

String variable names follow the rules of numeric variables+$.

String length is dynamic up to 255 characters. Undefined string variables return an empty string.

DEFSTR <letter range> allows names without $.

DIM A(...) defines array. REAL, SHORT or INTEGER A(...)

define arrays of certain type. See above for naming

restrictions.

DIM Name(...) defines array. Array names follow the

rules of numeric variables. DIM statements are static

declarations and must appear above any reference to

the array in the program. DIM cannot appear after

THEN or ELSE. After a DIM statement only comments

are allowed on the same line.

DIM Name(...) defines array.

Array names follow the rules of numeric variables.

Static declaration

like TI-74.

Dimension and size can be expressions.

Existing arrays can be redimensioned

without data loss.

DIM A$(n)[L] defines string array and sets

string length to L. See above for naming

restrictions. Only one dimension allowed.

Default length is 32, maximum is memory

dependent.

DIM Name$(...) defines string array.

Array names follow the rules of numeric variables.

String length is dynamic up to 255 characters.

See above for DIM statement restrictions.

DIM Name$(...) defines string array.

String array names follow the rules of string variables.

String length is dynamic up to 255 characters.

Two dimensions. Size is only limited by memory. OPTION

BASE 0 or 1 set the lowest index for next DIM statement.

Three dimensions. Size is only limited by memory.

Dimensions must be constant.

Number and size of dimensions is only limited by memory. Dimensions can be

expressions.

Limits see left.

OPTION BASE 0 or 1 set the lowest index

for all arrays.

Arrays of dimension (10) or (10,10) can be created

implicitly by an assignment.

Arrays of dimension (10), (10,10) or (10,10,10) can be

created implicitly by an assignment.

DESTROY ALL deletes all variables and

arrays.

Program editing, power cycling, NEW or RUN delete all

variables.

Power cycling, NEW, RUN or CLEAR delete all variables.

DESTROY deletes selected variables or

arrays.

CALL CLEANUP clears

variables not used by the

program.

SLEEP turns power of without deleting the

variables.

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