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76 Pascal 4.0 Userās Guide
5
Using Program Units
The program unit is the source program with the program header. It has the
following syntax:
<program unit> ::= <program heading> <declaration list> <program body>
Each program you write can have only one program unit. The program body
is the ļ¬rst code that Pascal executes.
Using Module Units
A module unit is a source program that does not have a program header. It
has the following syntax:
<module unit> ::= [ <module heading>]<declaration list>
The module heading contains the reserved word module followed by an
identiļ¬er:
<module heading> ::= [ 'module' <identiļ¬er> ';' ]
For example:
This is a legal module heading. The module heading is optional.
Sharing Variables and Routines Across Multiple Units
Pascal supports three methods of sharing variables and routines between units:
ā¢ include ļ¬les
ā¢ Multiple variable declarations
ā¢ extern/define variable declarations
These methods are not mutually exclusive; for example, you can declare a
variable as either extern or define in an include ļ¬le.
The following sections describe these methods.
module sum;
- Pascal 4.0 Userās Guide 1
- Contents 3
- Contents v 5
- Contents vii 7
- Contents ix 9
- Contents xi 11
- Contents xiii 13
- Operating Environment 19
- Installation 19
- Audience 20
- Organization 20
- Related Documentation 22
- README Files 23
- Other Related Documentation 23
- Introduction 25
- Pascal Compiler 26
- Features 26
- Compatibility 26
- Text Editors 27
- Debuggers 27
- XView Toolkit 27
- Native Language Support 27
- Internationalization 28
- Licensing 29
- 6 Pascal 4.0 Userās Guide 30
- Pascal Programs 31
- Compiling the Program 32
- Running the Program 33
- Renaming the Executable File 33
- An Interactive Pascal Program 34
- Redirecting I/O 35
- Where Did My Program Fail? 37
- Using the -g Option 39
- The Pascal Compiler 41
- Compile and Link Sequence 42
- Language Preprocessor 43
- āBbinding 48
- The Pascal Compiler 25 49
- {$b0} No buffering 49
- {$b1} Line buffering 49
- 26 Pascal 4.0 Userās Guide 50
- āDname[=def] 51
- 28 Pascal 4.0 Userās Guide 52
- -fnonstd 53
- āfround=r 53
- āftrap=t 54
- The Pascal Compiler 31 55
- āhelp or -flags 56
- āIpathname 56
- -keeptmp 56
- -Ldirectory 57
- -libmieee 58
- āmisalign 58
- ānolibmil 59
- -noqueue 59
- -notrace 60
- āO[level] 60
- The Pascal Compiler 37 61
- āo ļ¬lename 62
- āp and āpg 63
- āpic,-Kpic and āPIC, -KPIC 63
- āQoption 64
- āQpath pathname 64
- āQproduce 64
- -R path[ 65
- 42 Pascal 4.0 Userās Guide 66
- Examples: 67
- 46 Pascal 4.0 Userās Guide 70
- ātemp=dir 71
- The Pascal Compiler 49 73
- 50 Pascal 4.0 Userās Guide 74
- v7 or v8 machine 76
- -xcache=c 77
- ā¢ generic 77
- ā¢ s1/l1/a1 77
- ā¢ s1/l1/a1:s2/l2/a2 77
- ā¢ s1/l1/a1:s2/l2/a2:s3/l3/a3 77
- -xchip=c 78
- -xildoff 80
- -xlibmieee 80
- -xlibmil 80
- The Pascal Compiler 57 81
- -xprofile=p 82
- -xregs=r 84
- The Pascal Compiler 61 85
- -xtarget=t 86
- Program Construction and 91
- Management 91
- Compiling with Units 93
- Using Units and Header Files 94
- Libraries 98
- Separate Compilation 99
- Using Program Units 100
- Using Module Units 100
- ā¢ include ļ¬les 100
- Sharing Public Variables 101
- Using the -xl Option 104
- Using the define Declaration 107
- Using include Files 108
- , inc_mod2.p module inc_mod2; 109
- Using extern 110
- 88 Pascal 4.0 Userās Guide 112
- The CāPascal Interface 113
- Theshortreal Type 115
- Character Strings 115
- Incompatibilities 116
- Procedure Calls: CāPascal 117
- Variable Parameters 118
- Simple Types without āxl 119
- Simple Types with āxl 120
- Strings of Characters 120
- Fixed Arrays 121
- The univ Arrays 124
- Conformant Arrays 125
- Records and Structures 129
- Consider this example: 131
- Variant Records 132
- Pascal Set Type 134
- Pascal intset Type 135
- Value Parameters 136
- Function Return Values 139
- Input and Output 140
- Procedure Calls: PascalāC 141
- Following are some examples: 150
- Non-Pascal Procedures 151
- See this example: 152
- 136 Pascal 4.0 Userās Guide 160
- The C++āPascal Interface 161
- C++ Name Encoding 162
- Procedure Calls: C++āPascal 162
- Arguments Passed by Reference 163
- Arguments Passed by Value 174
- Simple Types 177
- Type shortreal 178
- Procedure Calls: PascalāC++ 179
- Pascal. See this example: 185
- Pascal File Pointers to C++ 186
- The FORTRANāPascal Interface 187
- , byte, or 189
- Pascal Set Types 191
- Multidimensional Arrays 191
- See the following example: 193
- Pascalintset Type 203
- Typeshortreal 206
- Pointers 207
- Character Dummy Arguments 213
- Routines as Parameters 226
- 204 Pascal 4.0 Userās Guide 228
- Error Diagnostics 229
- String Errors 230
- Digits in Real Numbers 230
- Compiler Semantic Errors 234
- Thescalar Class 235
- Scalar Error Messages 236
- Expression Diagnostics 236
- Type Equivalence 238
- Unreachable Statements 239
- Thegoto Statement 240
- Uninitialized Variables 240
- Compiler Panics, I/O Errors 241
- Runtime Errors 241
- 218 Pascal 4.0 Userās Guide 242
- Error Diagnostics 219 243
- 220 Pascal 4.0 Userās Guide 244
- The XView Toolkit 245
- Object-Oriented Programming 246
- Pascal Interface 247
- Compiling with Libraries 248
- Header Files 248
- Attribute Lists 249
- Conversion of C to Pascal 251
- 1. Deļ¬ned in stddefs_p.h 252
- Sample Program 254
- Menu Demo Program 255
- Now run the executable ļ¬le: 256
- Math Libraries 257
- IEEE Support Functions 260
- SPARC Libraries 262
- Arithmetic Exceptions 263
- 244 Pascal 4.0 Userās Guide 268
- Pascal Preprocessor 269
- Compiler Directives 270
- The%config Directive 271
- The %debug Directive 273
- The %else Directive 274
- The %elseif Directive 275
- The%elseifdef Directive 276
- Comments 277
- The %enable Directive 278
- The %endif Directive 279
- The%error Directive 279
- The%exit Directive 280
- The%if Directive 281
- The%ifdef Directive 282
- The%include Directive 283
- The %list Directive 284
- The %nolist Directive 286
- The %slibrary Directive 287
- The%var Directive 287
- The%warning Directive 287
- Error Messages 289
- 266 Pascal 4.0 Userās Guide 290
- Error Messages 267 291
- 268 Pascal 4.0 Userās Guide 292
- Error Messages 269 293
- 270 Pascal 4.0 Userās Guide 294
- Error Messages 271 295
- 272 Pascal 4.0 Userās Guide 296
- Error Messages 273 297
- 274 Pascal 4.0 Userās Guide 298
- Error Messages 275 299
- 276 Pascal 4.0 Userās Guide 300
- Error Messages 277 301
- 278 Pascal 4.0 Userās Guide 302
- Error Messages 279 303
- 280 Pascal 4.0 Userās Guide 304
- Error Messages 281 305
- 282 Pascal 4.0 Userās Guide 306
- Error Messages 283 307
- 284 Pascal 4.0 Userās Guide 308
- Error Messages 285 309
- 286 Pascal 4.0 Userās Guide 310
- Error Messages 287 311
- 288 Pascal 4.0 Userās Guide 312
- Error Messages 289 313
- 290 Pascal 4.0 Userās Guide 314
- Error Messages 291 315
- 292 Pascal 4.0 Userās Guide 316
- Error Messages 293 317
- 294 Pascal 4.0 Userās Guide 318
- Error Messages 295 319
- 296 Pascal 4.0 Userās Guide 320
- Index 307 331
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