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Chapter 6. Expressions and Operators
81
6.3.2 Relational Operators
A relational operator compares two values. Depending upon whether the comparison is true or
false, the operator returns true (–1) or false (0).
With the operation result, you can control the program flow.
The relational operators include the following:
If an expression contains both arithmetic and relational operators, the arithmetic operator has
higher precedence than the relational operator.
Relational Operators Meanings Examples
=
Equal to
A = B
<> or ><
Not equal to
A <> B
<
Less than
A < B
>
Greater than
A > B
<=
or =<
Less than or equal to
A <= B
>=
or =>
Greater than or equal to
A >= B
- How this book is organized 4
- Bar Code and 2D Code 8
- Abbreviations 8
- Related Publications 8
- Screen Indication 8
- Chapter 1 9
- Software Overview for the BHT 9
- 1.1 Software Overview 10
- 1.1.2 Overview of BHT-BASIC 12
- 1.2 BHT-BASIC 13
- BHT-BASIC 3.0? 14
- PRIVATE or GLOBAL statement) 15
- 1.3.1 Compiler 16
- 1.3.2 Interpreter 16
- Chapter 2 17
- 2.1.1 Required Hardware 19
- 2.1.2 Required Software 20
- 2.2.1 Developing Procedures 21
- 2.3 Writing a Source Program 23
- 2.4 Producing a User Program 25
- Procedure 26
- [ 1 ] Select a source file 27
- [ 1 ] Create a new project 28
- 2.4.4 Compiling and Building 33
- [ 2 ] Compiling 34
- [ 3 ] Building 34
- Main Window 36
- 2.4.7 Options 38
- [ 2 ] Linking options 39
- • Label–address file (.LBL) 39
- [ 4 ] Outputting list files 40
- Address-source list 40
- Symbol table 41
- Cross reference 42
- [ 5 ] Outputting a mapfile 43
- • Details of object codes 44
- Command Line 45
- [ 2 ] Options 46
- 2.5 Downloading 52
- 2.6 Executing a User Program 53
- Chapter 3 54
- 3.1 Program Overview 55
- [ 3 ] User-defined Functions 56
- 3.2 Handling User Programs 58
- 3.2.3 Included Files 59
- Chapter 4 60
- [ 1 ] Labels 61
- [ 2 ] Statements 62
- [ 3 ] Comments 62
- 4.1.2 Program Line Length 63
- 4.2 Usable Characters 64
- PRINT USING statement 65
- DATE$ function 65
- 4.3 Labels 67
- 4.4 Identifiers 68
- 4.5 Reserved Words 69
- Chapter 5 70
- 5.1 Constants 71
- Real Constants 72
- [ 1 ] String Variables 73
- [ 2 ] Numeric Variables 74
- Work Variables 75
- Common Variables 75
- Register Variables 75
- 5.3 User-defined Functions 76
- 5.4 Type Conversion 77
- AND, OR, NOT, and XOR 78
- 5.5 Scope of Variables 79
- 5.5.2 Local Variables 81
- 5.5.4 Common Variables 83
- Chapter 6 84
- 6.1 Overview 85
- 6.2 Operator Precedence 86
- 5.0/20 (=0.25) 87
- 0.25*2 (=0.5) 87
- 4+0.5 (=4.5) 87
- 4.5-1 (=3.5) 87
- 6.3 Operators 88
- 6.3.2 Relational Operators 89
- NOT operator 90
- AND operator 91
- OR operator 91
- XOR operator 91
- 6.3.4 Function Operators 92
- 6.3.5 String Operators 92
- PRINT a1$<b1$ 93
- Chapter 7 94
- 7.1 Output to the LCD Screen 96
- Screen mode 97
- Font size 97
- Display angle 97
- Reverse font attribute 98
- Enlargement attribute 98
- Tone attribute 98
- 7.1.2 Coordinates on the LCD 99
- 12 x 12 dots (Regular) 102
- 24 x 12 dots (Double-width) 102
- 12 x 24 dots 102
- (Double-height) 102
- 24 x 24 dots (Quadruple) 102
- Chapter 7. I/O Facilities 103
- Two-byte Kanji Mode 103
- • Standard-size font 103
- • Small-size font 104
- Cursor shape 105
- In regular size 107
- In double-width 107
- In double-height 107
- In quadruple size 107
- 16 dots12 dots 110
- Moves the cursor position 110
- Small-size font coordinates 110
- Display position of the 111
- Coordinates 111
- Loading a user-defined font 112
- 7.1.6 VRAM 113
- ’Set bit 7 only to 1 114
- Setting national characters 115
- Specifying the cursor shape 115
- 7.2 Input from the Keyboard 116
- Alphabet Entry Procedure 117
- [ 1 ] Auto-repeat 118
- [ 2 ] Shift key 118
- 7.3 Timer and Beeper 119
- OUT Statement 120
- INP Function 120
- WAIT Statement 121
- 7.5.1 Outline 122
- 13 14 15 16 123
- Non-shift mode Shift mode 123
- F1 F2 F3 F4 125
- F5 F6 F7 F8 125
- F9 F10 F11 F12 125
- F13 F14 F15 F16 125
- [ 5 ] Keystroke trapping 126
- 7.5.3 User-Defined Touch Keys 127
- "CONSOLE 128
- FN3" 128
- 7.5.4 Software Keyboard 129
- OUT statement 130
- OUT 5,0) 130
- OUT 5,3) 130
- Chapter 8 133
- 8.1 File Overview 134
- 8.2 Data Files 135
- 8.2.3 Structure of Data Files 136
- • Number of Written Records 137
- Input/Output for Numeric Data 138
- Data Retrieval 138
- Deletion of Data Files 138
- Drive Defragmentation 139
- 8.2.6 About Drives 140
- 8.3 Bar Code Device 141
- BHT-100B 142
- EOF, INP 144
- Code Mark 145
- Multiple Code Reading 145
- Reading 146
- 8.4 Communications Device 149
- [ 1 ] BHT-protocol 150
- [ 2 ] BHT-Ir protocol 151
- 8.4.4 File Transfer Tools 152
- Chapter 9 153
- 9.1 Overview 154
- 9.2 Event Polling 155
- 9.3 Error Trapping 157
- [ 1 ] Overview 159
- Chapter 10 161
- 10.1 Sleep Function 162
- Chapter 11 163
- 11.1 Resume Function 164
- Chapter 12 165
- 12.1 Low Battery Warning 166
- 12.3 Wakeup Function 167
- 12.4 Remote Wakeup Function 168
- [ 3 ] Remote wakeup program 170
- CHAIN statement, the 171
- Chapter 13 173
- Chapter 14 176
- Parameter: 177
- Description: 177
- 0123 5678910114 179
- Syntax errors: 180
- Run-time errors: 180
- Example: 180
- Reference: 181
- DEF FN (Single-line form) 202
- (Block form) 206
- FOR...NEXT 220
- FUNCTION…END FUNCTION 222
- IF...THEN...ELSE...END IF 234
- KEY ON and KEY OFF 246
- LINE INPUT 256
- LINE INPUT # 259
- This cursor is invisible 262
- This cursor is visible 262
- LOCATE ,25 263
- PRINT “A”; 263
- ON ERROR GOTO 265
- ON...GOSUB and ON...GOTO 266
- ON KEY...GOSUB 268
- OPEN "BAR:" 272
- W instead of K 284
- OPEN statement 284
- "A:A12" 287
- OPEN "COM:" 294
- PRINT USING 307
- SELECT...CASE...END SELECT 327
- SUB...END SUB 329
- WHILE...WEND 335
- $INCLUDE 342
- Fatal Error: 343
- COMMON statement) 344
- DEFREG statement) 344
- Chapter 15 345
- COUNTRY$ 356
- LOC function 381
- TIMEA/TIMEB/TIMEC 393
- Chapter 16 395
- Extended Functions 395
- 16.1 Overview 396
- (SYSTEM.FN3) 397
- R/W: Read and write possible 398
- RO: Read only 398
- 8 bytes 2 bytes 8 bytes 404
- .syOkOthLk 405
- .syLkNoRes 405
- Screen (CONSOLE.FN3) 407
- .fcDot Draw a dot 408
- .fcLine Draw a full line 409
- .fcDtLine Draw a dotted line 410
- .fcRect Draw a rectangle 413
- .fcDotGet Get drawn dot state 414
- .cnW1H1 0 Regular-size 417
- .cnW2H1 1 Double-width 417
- .cnW1H2 2 Double-height 417
- .cnW2H2 3 Quadruple-size 417
- .fcLcdClr Clear the LCD 418
- (SYSMDFY.FN3) 419
- .fcCrc16 Calculate a CRC-16 424
- Chapter 17 425
- PWBS C SF 426
- FTP.FN3) for file transfer 428
- 17.4.1 Overview 430
- Chapter 18 436
- 18.1 Two Sides 438
- 18.2.1 General Procedure 439
- [ 2 ] Configure TCP/IP System 440
- Note for run-time error 105h 448
- 18.2.4 Sample Program 449
- 18.3.1 General Procedure 450
- 18.3.4 Sample Program 456
- Chapter 18. TCP/IP 457
- 18.4 Socket API 459
- According to TCP and UDP 461
- (Example) 463
- 18.5 FTP Client 467
- [ 3 ] Data Files 470
- 18.5.3 Using FTP Client 473
- User Programs (*.PD3) 474
- [ 5 ] FTP Transfers 475
- 18.6.1 Overview 476
- Function Number List 477
- .fcConnect Connect socket 480
- .fcGSckOpt Get socket option 481
- 32-bit integer 482
- • • • • • • • • 484
- .fcSSckOpt Set socket options 494
- .fcShutdwn Shut down socket 495
- .fcSocket Create socket 496
- .fcClose Close socket 497
- 18.7 FTP Library (FTP.FN3) 503
- Reply Codes 504
- PARA% Item number 516
- FTP.PARA%/FTP.PARA$) 516
- Appendices 520
- Appendix A 521
- A2. Compilation Errors 525
- Error code & Message 526
- Syntax Errors 527
- Linking Errors 531
- Error Message 532
- Library Errors 533
- Appendix B 534
- Reserved Words 534
- Appendix C 535
- Character Sets 535
- C2. National Character Sets 536
- Appendix D 537
- I/O Ports 537
- TIME$ function -0System time 538
- RS/CS control 541
- Output Ports 543
- Appendix E 548
- Appendix F 549
- Memory Area 549
- Memory Management 550
- Battery Backup of Memory 550
- Host computer 551
- SEARCH function 552
- Example 3 553
- XFILE statement 554
- Appendix H 555
- Programming Notes 555
- Appendix I 556
- Program Samples 556
- Appendix J 559
- Quick Reference 559
- Handling errors 560
- Controlling the LCD screen 561
- Communicating with I/Os 563
- Commenting a program 565
- Manipulating numeric data 565
- Manipulating string data 566
- Specifying included files 566
- Appendix K 567
- BHT-BASIC 577
- Programmer’s Manual 577
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