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Chapter 6. Expressions and Operators
79
6.3 Operators
6.3.1 Arithmetic Operators
Arithmetic operators include a negative sign (-) and operators for multiplication (*), division (/),
addition (+), and subtraction (-). They also include modulo operator MOD.
Operations Arithmetic Operators Precedence Examples
Negation
Multiplication and division
Modulo arithmetic
Addition and subtraction
-
* and /
MOD
+ and -
1
2
3
4
-a
a*b, a/b
a MOD b
a+b, a-b
Modulo Operation (MOD)
Modulo Operation (MOD)Modulo Operation (MOD)
Modulo Operation (MOD)
The MOD operator executes the modulo operation; that is, it divides expression 1 by
expression 2 (see the format below) and returns the remainder.
Syntax: expression1 MOD expression2
Where one or more spaces or tab codes should precede and follow the MOD.
If these expressions include real values, the MOD first rounds them off to integers and then
executes the division operation. For example, the MOD treats expression 8 MOD 3.4 as 8
MOD 3 so as to return the remainder "2".
Overflow and Division by Zero
Overflow and Division by ZeroOverflow and Division by Zero
Overflow and Division by Zero
Arithmetic overflow resulting from an operation or division by zero will cause a run-time
error. Such an error may be trapped by error trapping.
- Preface 3
- How this book is organized 4
- Chapter 1 9
- 1.1 Software Overview 10
- 1.1.2 Overview of BHT-BASIC 12
- 1.2 BHT-BASIC 13
- BHT-BASIC 3.0? 14
- 1.3 Program Development and 16
- Execution 16
- Chapter 2 17
- 2.1 Overview of Development 19
- Environment 19
- 2.1.2 Required Software 20
- 2.2 Overview of Developing 21
- Procedures 21
- Production Procedure 26
- [ 1 ] Select a source file 27
- [ 1 ] Create a new project 28
- in the toolbar 33
- [ 2 ] Compiling 34
- [ 3 ] Building 34
- Main Window 36
- 2.4.7 Options 38
- [ 2 ] Linking options 39
- [ 4 ] Outputting list files 40
- [ 5 ] Outputting a mapfile 43
- Command Line 45
- [ 2 ] Options 46
- Description 47
- 2.5 Downloading 52
- 2.6.1 Starting 53
- 2.6.2 Execution 53
- 2.6.3 Termination 53
- Chapter 3 54
- 3.1 Program Overview 55
- Jump into Jump out 57
- 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
- 4.3 Labels 67
- 4.4 Identifiers 68
- 4.5 Reserved Words 69
- Chapter 5 70
- 5.1 Constants 71
- 5.2 Variables 73
- [ 2 ] Numeric Variables 74
- 5.3 User-defined Functions 76
- 5.4 Type Conversion 77
- 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
- 6.3 Operators 87
- 6.3.2 Relational Operators 88
- 6.3.3 Logical Operators 89
- [ 2 ] The AND operator 90
- [ 3 ] The OR operator 90
- [ 4 ] The XOR operator 90
- 6.3.4 Function Operators 91
- 6.3.5 String Operators 91
- Chapter 7 93
- 7.1.1 Display Fonts 94
- 7.1.3 Dot Patterns of Fonts 100
- Same Screen 105
- 7.1.6 VRAM 107
- 7.1.7 Displaying the System 109
- 7.2 Input from the Keyboard 112
- [ 1 ] Auto-repeat 114
- [ 2 ] Shift key 114
- 7.3 Timer and Beeper 115
- Chapter 8 118
- 8.1 File Overview 119
- 8.2 Data Files 120
- Information 122
- 8.2.6 About Drives 125
- 8.3 Bar Code Device 126
- 8.4 Communications Device 130
- [ 1 ] BHT-protocol 132
- [ 2 ] BHT-Ir protocol 133
- 8.4.5 File Transfer Tools 134
- Chapter 9 135
- 9.1 Overview 136
- 9.2 Event Polling 137
- 9.3 Error Trapping 139
- [ 1 ] Overview 141
- Chapter 10 143
- 10.1 Sleep Function 144
- Chapter 11 145
- 11.1 Resume Function 146
- Chapter 12 147
- 12.1 Low Battery Warning 148
- 12.2 Prohibited Simultaneous 148
- Operation of the Beeper 148
- Illumination LED, and LCD 148
- Backlight 148
- 12.3 Wakeup Function 149
- 12.4 Remote Wakeup Function 150
- [2] Remote wakeup operation 151
- [3] Remote wakeup program 154
- Chapter 13 157
- 13.1 Backlight Function 158
- Chapter 14 160
- DECLARE 183
- DEF FN…END DEF 189
- FOR…NEXT 203
- FUNCTION…END FUNCTION 205
- IF…THEN…ELSE…END IF 215
- INPUT # 220
- KEY ON and KEY OFF 226
- LINE INPUT 236
- LINE INPUT # 238
- ON ERROR GOTO 243
- ON…GOSUB, ON…GOTO 244
- ON KEY…GOSUB 246
- OPEN "BAR: " 250
- □Universal product codes (A) 254
- OPEN "COM: " 260
- PRINT # 270
- PRINT USING 272
- PRIVATE 276
- RESTORE 284
- SELECT…CASE…END SELECT 290
- SUB…END SUB 292
- WHILE…WEND 298
- $INCLUDE 305
- Chapter 15 308
- CHKDGT$ 313
- COUNTRY$ 319
- SEARCH 347
- TIMEA/TIMEB/TIMEC 354
- Chapter 16 356
- 16.1 Overview 357
- (SYSTEM.FN3) 358
- R/W: Read and write possible 359
- Read and write possible 361
- 16.3 Controlling system 364
- Chapter 17 367
- 17.1 Two Sides 369
- 17.2 Programming Procedure 370
- 'interface% 374
- 17.3 Socket API 375
- Chapter 17. TCP/IP 381
- (Example) 381
- 17.4 FTP Client 384
- [ 3 ] Data Files 388
- 17.4.3 Using FTP Client 391
- User Programs (*.PD3) 392
- [ 5 ] FTP Transfers 393
- 17.5.1 Overview 394
- Function Number List 395
- Function #2 .fcBind 397
- Assign address to socket 397
- Function #3 .fcConnect 398
- Connect socket 398
- Run-time errors: 399
- Function #6 .fcGSckOpt 400
- Get socket option 400
- Function #11 .fcNToHL 403
- Function #12 .fcNToHS 403
- Function #14 .fcRecv 404
- Example: Append operation 406
- Example: Overwrite operation 407
- Function #15 .fcRcvfrom 408
- Function #17 .fcSelect 410
- Monitor socket requests 410
- Return value: (None) 412
- Function #21 .fcFDISSET 413
- Function #22 .fcSend 414
- Function #23 .fcSendto 416
- Function #24 .fcSSckOpt 418
- Set socket options 418
- Function #25 .fcShutdwn 420
- Shut down socket 420
- Function #26 .fcSocket 421
- Create socket 421
- Function #28 .fcClose 423
- Close socket 423
- Function #40 .fcTSetup 424
- Function #41 .fcTCnnSys 425
- Function #42 .fcTCnnUsr 426
- Function #43 .fcTDiscnn 428
- Function #44 .fcTSysGet 429
- Get TCP/IP system settings 429
- Function #45 .fcTSysSet 430
- Set TCP/IP system settings 430
- Function #46 .fcTStsGet 431
- Get TCP socket status 431
- 17.6 FTP Library (FTP.FN3) 432
- Reply Codes 433
- Function #1 .fcFTPOpnS 435
- Function #2 .fcFTPOpnU 436
- Function #3 .fcFTPClos 437
- Close FTP client session 437
- Function #4 .fcPWD 438
- Function #5 .fcCWD 439
- Function #6 .fcRETR 440
- Function #7 .fcSTOR 444
- Upload file to FTP server 444
- Function #8 .fcFSysGet 446
- Get FTP system settings 446
- Function #9 .fcFSysSet 447
- Change FTP system settings 447
- Function #10 .fcRNFR 448
- Function #11 .fcPORT 449
- Function #12 .fcDELE 450
- Delete file from FTP server 450
- Chapter 18 451
- 18.1.1 Introduction 452
- 18.1.2 System Components 453
- Availabl 454
- 18.2 Programming Overview 455
- Vicinity (Inquiry) 457
- Chapter 18. Bluetooth 461
- 18.2.3.4 Service Discovery 466
- 18.2.4 Programming Notes 468
- 18.2.4.3 Resume Operation 471
- User Program 473
- Functions 474
- [#]filenumber 476
- Syntax errors: 477
- Syntax errors:Syntax errors: 477
- (BT.FN3) 489
- Function #1 .fcBTGetVal 490
- Function #2 .fcBTSetVal 491
- Function #3 .fcBTGetStr 492
- Function #4 .fcBTSetStr 494
- Function #7 .fcBTSysVer 495
- Function #8 .fcBTDevInf 496
- Function #9 .fcBTRmtNam 498
- Get remote device name 498
- Function #10 .fcBTInqRes 500
- Function #11 .fcBTRmtInf 502
- Function #12 .fcBTGetStt 503
- Read connection status 503
- Function #13 .fcBTGetLnk 504
- Function #14 .fcBTClrLnk 505
- Function #15 .fcBTHold 506
- Control power-saving mode 506
- Function #20 .fcBTChkSnd 508
- Check data transmit result 508
- Function #21 .fcBTGetSvc 510
- Appendices 512
- AppendicesAppendices 512
- A2. Compilation Errors 517
- C1. Character Set 526
- C2. National Character Sets 527
- 'received 547
- 'the initial state 547
- Controlling program flow 549
- Statements 550
- Controlling the LCD screen 551
- Communicating with I/Os 553
- Commenting a program 555
- Manipulating numeric data 555
- Supplement 558
- SupplementSupplement 558
- A.1 Communication 559
- A.2 Bar code reading 560
- A.3 Screen display 561
- IndexIndex 573
- BHT-BASIC 587
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