Radio Shack CTR-118 User Manual Page 16
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- Table of contents
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1-4
Variable Names
Variable names must begin with a letter (A-Z) and may be followed by
another letter or digit (0-9). So the following are all valid and distinct
variable names:
AZZ Z1 A2 AA AZ G9 GP M MU
Variable names may be longer than two characters, but only the first two
characters will be used by the computer to distinguish between variables. For
example "SUM", "SUB" and "SU" will be treated as one and tile same
variable by LEVEL II BASIC.
As you can imagine, this gives you plenty of variable names to use in LEVEL
II (in the neighborhood of 900).
However, you cannot use variable
names, which contain words with special meaning in the BASIC
language.
For example, "XON" cannot be used as a variable name, since it
contains the BASIC keyword "ON". The complete list of "reserved words"
which cannot be used in variable names appears in Appendix A of this
Manual.
Variable Types
There are four types of variables in LEVEL II: integer, single precision,
double precision, and string variables. The first three types are used to store
numerical values with various degrees of precision; the last type stores
strings (sequences) of characters - letters, blanks, numbers and special
symbols - up to 255 characters long. LEVEL I only allowed two string
variables, A$ and B$ -but LEVEL II allows you to use any variable name for
strings, simply by adding the string declaration character, $, to the variable
name. There are declaration characters for the other variable types, too:
Here's a complete listing:
Variable Type
Declaration
Character Examples Typical values stored
integer (whole
numbers from -32768
to +32767)
% A%, B9% -30, 123, 3, 5001
single precision
(6 significant figures)
! or E A!, AA!, Z1! 1, -50, .123456,
353421, 1.23E-5
double precision
(16 significant
figures)
# A#, ZZ#, C#
-300.12345678
3.141592653589
1.000000000000001
double precision with
scientific notation (for
entering constants or
during output of large
or small numbers)
D "A#=1.2345678901D+12" 1.2345678901 x 1012
string (up to 255
characters)
$ A1$, GT$, HI$ "JOHN Q. DOE",
"WHISTLE-STOP"
"1+2=?"
- LIMITED WARRANTY 2
- One Tandy Center 3
- Fort Worth, Texas 76102 3
- CONTENTS 5
- This Reference Manual and You 7
- Setting up the System 9
- Notes on Using the Recorder 10
- Special Notes: 11
- 1 / General Information 13
- Operating Modes 14
- Special Function Keys 15
- Variable Names 16
- Variable Types 16
- Arithmetic Operators 17
- Relational Operators 18
- String Operators 19
- Order of Operations 19
- Intrinsic Functions 20
- Graphics 20
- Error Messages 20
- Abbreviations 20
- Keyboard Rollover 21
- Glossary for LEVEL II BASIC 22
- 2 / Commands 23
- CLOAD? " 25
- CSAVE"1" 26
- CSAVE"A" 26
- DELETE 5 26
- DELETE 11-18 26
- 3 / Input-Output 31
- @ position, item list 33
- PRINT TAB 33
- (expression) 33
- PRINT USING 34
- PRINT #-1 42
- INPUT #-1 42
- Sample Program 43
- 10 INPUT#-1,A1,B$,L$ 43
- 20 PRINT A1,B$,L$ 43
- 40 GOTO 10 43
- 4 / Program Statements 45
- 10 DEFINT A,I,N 46
- 10 DEFINT I-N 46
- 100 DEFSNG I,W-Z 47
- 10 DEFDBL S-Z, A-E 47
- 10 DEFSTR L-Z 48
- 10 CLEAR 1000 48
- ON ERROR GOTO 57
- Data Conversion 62
- Typing of Constants 62
- Type Conversion 63
- 5 / Strings 67
- String Input/Output 68
- String Comparisons 69
- String Operations 70
- String Space 70
- (string) 71
- (string, n) 74
- STRING$ 76
- Coding/Decoding Program 78
- Instring Subroutine 78
- 6 / Arrays 81
- Other Types of Arrays 84
- 7 / Arithmetic Functions 89
- 100 K%=CINT(X#)+CINT(Y#) 90
- 100 Y=COS(X+3.3) 90
- 100 PRINT CSNG(A#+B#) 90
- 100 PRINT EXP(-X) 91
- 100 Y=ABS(A-FIX(A)) 91
- 100 Z=INT(A*100+.5)/100 91
- 100 PRINT LOG(3.3*X) 91
- 8 / Special Features 95
- ERR /2+1 98
- (address) 100
- CALL 0A7FH 103
- JP 0A9AH 103
- (variable name) 107
- Logical Operators 109
- 20 GOTO 10 111
- 9 / Editing 113
- ENTER key 114
- Space-bar 114
- 100 FOR I=1 TO 10_ 115
- 100 FOR I=_ 115
- L (List Line) 116
- X (Extend Line) 116
- I (Insert) 117
- A (Cancel and Restart) 117
- E (Save Changes and Exit) 117
- Q (Cancel and Exit) 118
- H (Hack and Insert) 118
- D (Delete) 118
- 100 FOR I=1 TO 1_ 119
- 10 / Expansion Interface 121
- Line Printer 122
- LPRINT CHR$(10) 124
- LINE ONE 124
- LINE TWO 124
- LINE THREE 124
- POKE 16424,40 125
- POKE 16425,0 125
- Mini-Disks - (DISK BASIC) 126
- Additions to LEVEL II 126
- Expansion of RAM Memory 127
- 11 / Saving Time and Space 129
- Speeding Up Execution 130
- Appendix 131
- A / Level II Summary 133
- Commands 135
- Input/Output Statements 138
- Program Statements 140
- String Functions 144
- Arithmetic Functions* 145
- Special Functions 146
- LEVEL II Reserved Words* 148
- B / Error Codes 151
- Explanation of Error Messages 152
- Hard-To-Find Errors 153
- C / TRS-80 Character Codes 155
- Decimal/Hexadecimal Codes 156
- Control Codes: 0-31 157
- Graphics Codes: 128-191 158
- Graphic Characters 161
- D / Memory Map 163
- Important Addresses 164
- F / Derived Functions 167
- G / Base Conversions 169
- H / User Programs 173
- Sort Routine 175
- Space-Ship Lander 176
- Customer Information 178
- Target Practice 180
- Using Your Cassette Deck 185
- LEVEL II 187
- Hints and Tips 187
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