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Chapter 4. Basic Program Elements
67
4.5 Reserved Words
"Reserved words" are keywords to be used in statements, functions, and operators. For the
reserved words, refer to Appendix B, "Reserved Words."
■
Rules for using reserved words
• A reserved word cannot be used by itself for a label name, a variable name, or other
identifiers, but can be included within them. The following identifiers, for example, are
improper since they use reserved words "input" and "key" as is, without modification:
input = 3
key = 1
• A reserved word can be used for a data file name as shown below.
OPEN "input" AS #1
- How this book is organized 4
- Icons Used in This Book 7
- Compiler and Interpreter 8
- Easy Pack 8
- BHT and CU 8
- Abbreviations 9
- Related Publications 9
- Screen Indication 9
- Chapter 1 10
- 1.1 Software Overview 11
- ■ BHT-5000/BHT-6000/BHT-6500 13
- 1.1.2 Overview of BHT-BASIC 16
- 1.2 BHT-BASIC 17
- BHT-BASIC 3.0? 18
- Defining constants 19
- 1.3.1 Compiler 20
- 1.3.2 Interpreter 20
- Chapter 2 21
- 2.1.1 Required Hardware 23
- 2.1.2 Required Software 24
- 2.2.1 Developing Procedures 25
- 2.3 Writing a Source Program 27
- 2.4 Producing a User Program 29
- Procedure 30
- [ 1 ] Select a source file 31
- [ 1 ] Create a new project 32
- 2.4.4 Compiling and Building 37
- [ 2 ] Compiling 38
- [ 3 ] Building 38
- Main Window 40
- 2.4.7 Options 42
- [ 2 ] Linking options 43
- • Label–address file (.LBL) 43
- [ 4 ] Outputting list files 44
- Address-source list 44
- Symbol table 45
- • Symbol table for labels 46
- Cross reference 47
- [ 5 ] Outputting a mapfile 48
- • Details of object codes 49
- Command Line 50
- [ 2 ] Options 51
- 2.5 Downloading 57
- 2.5.2 Setting up the BHT 58
- BHT-5000/BHT-6000/BHT-6500 59
- BHT-7000/BHT-7500 59
- 2.6 Executing a User Program 60
- Chapter 3 61
- 3.1 Program Overview 62
- [ 3 ] User-defined Functions 63
- 3.2 Handling User Programs 65
- 3.2.3 Included Files 66
- Chapter 4 67
- [ 1 ] Labels 68
- [ 2 ] Statements 69
- [ 3 ] Comments 69
- 4.1.2 Program Line Length 70
- 4.2 Usable Characters 71
- PRINT USING statement 72
- DATE$ function 72
- 4.3 Labels 74
- 4.4 Identifiers 75
- 4.5 Reserved Words 76
- Chapter 5 77
- 5.1 Constants 78
- Real Constants 79
- [ 1 ] String Variables 80
- [ 2 ] Numeric Variables 81
- Work Variables 82
- Common Variables 82
- Register Variables 82
- 5.3 User-defined Functions 83
- 5.4 Type Conversion 84
- AND, OR, NOT, and XOR 85
- Chapter 6 86
- 6.1 Overview 87
- 6.2 Operator Precedence 88
- 5.0/20 (=0.25) 89
- 0.25*2 (=0.5) 89
- 4+0.5 (=4.5) 89
- 4.5-1 (=3.5) 89
- 6.3 Operators 90
- 6.3.2 Relational Operators 91
- NOT operator 92
- AND operator 93
- OR operator 93
- XOR operator 93
- 6.3.4 Function Operators 94
- 6.3.5 String Operators 94
- PRINT a1$<b1$ 95
- Chapter 7 96
- 7.1 Output to the LCD Screen 97
- [ 2 ] Switching the fonts 98
- [ 1 ] BHT-3000 98
- LOCATE 1,1 100
- LOCATE 26,1 100
- LOCATE 26,10 100
- LOCATE 1,9 101
- LOCATE 20,9 101
- LOCATE 1,2 101
- LOCATE 20,2 101
- LOCATE 26,2 102
- LOCATE 26,9 102
- LOCATE 21,1 103
- LOCATE 21,8 103
- LOCATE 1,7 104
- LOCATE 16,7 104
- LOCATE 1,2 LOCATE 16,2 104
- LOCATE 21,7 105
- LOCATE 21,2 105
- LOCATE 16,1 106
- LOCATE 16,6 106
- [ 5 ] BHT-7000 109
- [ 6 ] BHT-7500 113
- 7.1.3 Dot Patterns of Fonts 117
- Cursor shape 119
- Different-size Fonts 121
- Same Screen 122
- 7.1.6 VRAM 123
- 5000/BHT-6000/BHT-6500) 125
- Setting national characters 128
- Highlighting characters 128
- Specifying the cursor shape 128
- 7.2 Input from the Keyboard 129
- 7.2.2 Keystroke Trapping 130
- 7.2.3 Alphabet Entry Function 131
- Center Center 132
- Alphabet Entry Example 133
- BHT-5000 135
- BHT-7000/7500 135
- Entry System 136
- Alphabet Entry Procedure 137
- [ 1 ] Auto-repeat 139
- [ 2 ] Shift key 139
- 7.3 Timer and Beeper 140
- OUT Statement 141
- INP Function 141
- WAIT Statement 142
- Chapter 8 143
- 8.1 File Overview 144
- 8.2 Data Files 145
- 8.2.3 Structure of Data Files 146
- Input/Output for Numeric Data 148
- Data Retrieval 148
- Deletion of Data Files 148
- 8.2.6 About Drives 150
- 8.3 Bar Code Device 151
- Bar Code Buffer 152
- Code Mark 152
- Multiple Code Reading 152
- Generation of Check Digit 153
- 8.4 Communications Device 155
- For optical interface 156
- For direct-connect interface 157
- [ 1 ] BHT-protocol 158
- Protocol functions 159
- 8.4.4 File Transfer Tools 161
- XFILE statement 162
- Chapter 9 163
- 9.1 Overview 164
- 9.2 Event Polling 165
- 9.3 Error Trapping 167
- [ 1 ] Overview 169
- Chapter 10 171
- 10.1 Sleep Function 172
- Chapter 11 173
- 11.1 Resume Function 174
- Chapter 12 175
- 12.1 Low Battery Warning 176
- Backlight 177
- 12.3 Wakeup Function 178
- 12.4 Remote Wakeup Function 179
- (BHT-7000/BHT-7500) 179
- At the host computer 180
- Transmission control sequence 180
- [ 3 ] Remote wakeup program 182
- CHAIN statement, the 183
- Chapter 13 185
- 13.1 LCD Backlight Function 186
- Chapter 14 188
- Parameter: 189
- Description: 189
- Syntax errors: 192
- Run-time errors: 193
- Example: 193
- Reference: 193
- DEF FN (Single-line form) 214
- (Block form) 218
- FOR...NEXT 232
- FUNCTION…END FUNCTION 234
- IF...THEN...ELSE...END IF 246
- KEY ON and KEY OFF 258
- LINE INPUT 269
- LINE INPUT # 272
- ON ERROR GOTO 277
- ON...GOSUB and ON...GOTO 278
- ON KEY...GOSUB 280
- OPEN "BAR:" 284
- OPEN statement 293
- OPEN "COM:" 296
- PRINT USING 311
- SELECT...CASE...END SELECT 329
- SUB...END SUB 331
- WHILE...WEND 337
- $INCLUDE 344
- Fatal Error: 345
- COMMON statement) 346
- DEFREG statement) 346
- Chapter 15 347
- COUNTRY$ 358
- TIMEA/TIMEB/TIMEC 394
- Chapter 16 396
- 16.1 Overview 397
- (SYSTEM.FN3) 397
- SYSTEM.FN3 version 398
- R/W: Read and write possible 399
- RO: Read only 399
- 8 bytes 2 bytes 8 bytes 402
- Chapter 17 403
- FTP.FN3) for file transfer 406
- 17.3 Wireless Communications 407
- (SS.FN3) 408
- Chapter 18 414
- 18.1 Two Sides 415
- 18.2.1 General Procedure 416
- [ 2 ] Configure TCP/IP System 417
- 18.3 Socket API 426
- 18.4 FTP Client 428
- [ 3 ] Data Files 431
- 18.4.3 Using FTP Client 434
- User Programs (*.PD3) 435
- [ 5 ] FTP Transfers 436
- 18.5.1 Overview 437
- Function Number List 438
- Function #3: Connect socket 441
- Function #9: 443
- * To be set in units of 100 454
- Function #26: Create socket 456
- Function #28: Close socket 457
- Function #41: 458
- Function #42: 458
- 18.6 FTP Library (FTP.FN3) 461
- Reply Codes 462
- VERSION$ 463
- Appendices 473
- Appendix A 474
- A2. Compilation Errors 477
- Syntax Errors 479
- Error code & Message 481
- Linking Errors 483
- Error Message 484
- Library Errors 485
- Appendix B 486
- Reserved Words 486
- Appendix C 487
- Character Sets 487
- C2. National Character Sets 488
- KPLOAD statement. If the 489
- KPLOAD statement, the Inter 490
- Appendix D 492
- I/O Ports 492
- D2. BHT-4000 494
- D3. BHT-5000 497
- D4. BHT-6000/BHT-6500 501
- Output Ports 504
- OUT statement 504
- XFILE state 506
- D5. BHT-7000/BHT-7500 507
- RS/CS control 508
- state 508
- END, POWER 510
- Appendix E 514
- Non-shift mode Shift mode 514
- Non-shift mode 519
- Shift mode 519
- Memory Map 524
- Memory Management 526
- Battery Backup of Memory 526
- Host computer 528
- Appendix H 532
- Programming Notes 532
- Appendix I 535
- Program Samples 535
- Appendix J 538
- Quick Reference 538
- Handling errors 539
- Controlling the LCD screen 540
- Communicating with I/Os 542
- Commenting a program 544
- Manipulating numeric data 544
- Manipulating string data 545
- Specifying included files 545
- Appendix K 546
- - For others 547
- BHT-BASIC 560
- Programmer’s Manual 560
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