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Oracle Solaris Studio 12.3: C User's Guide     Oracle Solaris Studio 12.3 Information Library
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1.  Introduction to the C Compiler

2.  C-Compiler Implementation-Specific Information

2.1 Constants

2.1.1 Integral Constants

2.1.2 Character Constants

2.2 Linker Scoping Specifiers

2.3 Thread Local Storage Specifier

2.4 Floating Point, Nonstandard Mode

2.5 Labels as Values

2.6 long long Data Type

2.6.1 Printing long long Data Types

2.6.2 Usual Arithmetic Conversions

2.7 Case Ranges in Switch Statements

2.8 Assertions

2.9 Supported Attributes

2.10 Warnings and Errors

2.11 Pragmas

2.11.1 align

2.11.2 c99

2.11.3 does_not_read_global_data

2.11.4 does_not_return

2.11.5 does_not_write_global_data

2.11.6 dumpmacros

2.11.7 end_dumpmacros

2.11.8 error_messages

2.11.9 fini

2.11.10 hdrstop

2.11.11 ident

2.11.12 init

2.11.13 inline

2.11.14 int_to_unsigned

2.11.15 must_have_frame

2.11.16 nomemorydepend

2.11.17 no_side_effect

2.11.18 opt

2.11.19 pack

2.11.20 pipeloop

2.11.21 rarely_called

2.11.22 redefine_extname

2.11.23 returns_new_memory

2.11.24 unknown_control_flow

2.11.25 unroll

2.11.26 warn_missing_parameter_info

2.11.27 weak

2.12 Predefined Names

2.13 Preserving the Value of errno

2.14 Extensions

2.14.1 _Restrict Keyword

2.14.2 __asm Keyword

2.14.3 __inline and __inline__

2.14.4 __builtin_constant_p()


2.15 Environment Variables




2.15.4 TMPDIR

2.16 How to Specify Include Files

2.16.1 Using the -I- Option to Change the Search Algorithm Warnings

2.17 Compiling in Free-Standing Environments

2.18 Compiler Support for Intel MMX and Extended x86 Platform Intrinsics

3.  Parallelizing C Code

4.  lint Source Code Checker

5.  Type-Based Alias Analysis

6.  Transitioning to ISO C

7.  Converting Applications for a 64-Bit Environment

8.  cscope: Interactively Examining a C Program

A.  Compiler Options Grouped by Functionality

B.  C Compiler Options Reference

C.  Implementation-Defined ISO/IEC C99 Behavior

D.  Features of C99

E.  Implementation-Defined ISO/IEC C90 Behavior

F.  ISO C Data Representations

G.  Performance Tuning

H.  Oracle Solaris Studio C: Differences Between K&R C and ISO C


2.7 Case Ranges in Switch Statements

In standard C, a case label in a switch statement can have only one associated value. Solaris Studio C allows an extension found in some compilers, known as case ranges.

A case range specifies a range of values to associate with an individual case label. The case range syntax is:

case low ... high :

A case range behaves as if case labels had been specified for each value in the given range from low to high inclusive. (If low and high are equal, the case range specifies only the one value.) The lower and upper values must conform to the requirements of the C standard, that is, they must be valid integer constant expressions (C standard Case ranges and case labels can be freely intermixed, and multiple case ranges can be specified within a switch statement.

The following programming example illustrates case ranges in switch statements:

enum kind { alpha, number, white, other }; 
enum kind char_class(char c) 
     enum kind result;
     switch(c) {
         case 'a' ... 'z':
         case 'A' ... 'Z':
             result = alpha;
         case '0' ... '9':
             result = number;
         case ' ':
         case '\n':
         case '\t':
         case '\r':
         case '\v':
             result = white;
             result = other;
     return result; }  

Error conditions in addition to existing requirements on case labels are as follows::

If an endpoint of a case range is a numeric literal, leave whitespace around the ellipsis (...) to avoid one of the dots being treated as a decimal point.


 case 0...4;   // error
 case 5 ... 9; // ok