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  4. 6.37. The Character in Constants

6.37 The Character <ESC> in Constants

You can use the sequence ‘\e’ in a string or character constant to stand for the ASCII character <ESC>.

© Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-5.4.0/gcc/Character-Escapes.html

2. Language Standards Supported by GCC
2. Language Standards Supported by GCC
3. GCC Command Options
3. GCC Command Options
3.1. Option Summary
3.10. Options That Control Optimization
3.11. Options Controlling the Preprocessor
3.12. Passing Options to the Assembler
3.13. Options for Linking
3.14. Options for Directory Search
3.15. Specifying Subprocesses and the Switches to Pass to Them
3.16. Specifying Target Machine and Compiler Version
3.17. Hardware Models and Configurations
3.17.1. AArch64 Options
3.17.10. Darwin Options
3.17.11. DEC Alpha Options
3.17.12. FR30 Options
3.17.13. FRV Options
3.17.14. GNU/Linux Options
3.17.15. H8/300 Options
3.17.16. HPPA Options
3.17.17. IA-64 Options
3.17.18. LM32 Options
3.17.19. M32C Options
3.17.2. Adapteva Epiphany Options
3.17.20. M32R/D Options
3.17.21. M680x0 Options
3.17.22. MCore Options
3.17.23. MeP Options
3.17.24. MicroBlaze Options
3.17.25. MIPS Options
3.17.26. MMIX Options
3.17.27. MN10300 Options
3.17.28. Moxie Options
3.17.29. MSP430 Options
3.17.3. ARC Options
3.17.30. NDS32 Options
3.17.31. Nios II Options
3.17.32. Nvidia PTX Options
3.17.33. PDP-11 Options
3.17.34. picoChip Options
3.17.35. PowerPC Options
3.17.36. RL78 Options
3.17.37. IBM RS/6000 and PowerPC Options
3.17.38. RX Options
3.17.39. S/390 and zSeries Options
3.17.4. ARM Options
3.17.40. Score Options
3.17.41. SH Options
3.17.42. Solaris 2 Options
3.17.43. SPARC Options
3.17.44. SPU Options
3.17.45. Options for System V
3.17.46. TILE-Gx Options
3.17.47. TILEPro Options
3.17.48. V850 Options
3.17.49. VAX Options
3.17.5. AVR Options
3.17.50. Visium Options
3.17.51. VMS Options
3.17.52. VxWorks Options
3.17.53. x86 Options
3.17.54. x86 Windows Options
3.17.55. Xstormy16 Options
3.17.56. Xtensa Options
3.17.57. zSeries Options
3.17.6. Blackfin Options
3.17.7. C6X Options
3.17.8. CRIS Options
3.17.9. CR16 Options
3.18. Options for Code Generation Conventions
3.19. Environment Variables Affecting GCC
3.2. Options Controlling the Kind of Output
3.20. Using Precompiled Headers
3.3. Compiling C++ Programs
3.4. Options Controlling C Dialect
3.5. Options Controlling C++ Dialect
3.6. Options Controlling Objective-C and Objective-C++ Dialects
3.7. Options to Control Diagnostic Messages Formatting
3.8. Options to Request or Suppress Warnings
3.9. Options for Debugging Your Program or GCC
4. C Implementation-Defined Behavior
4. C Implementation-Defined Behavior
4.1. Translation
4.10. Qualifiers
4.11. Declarators
4.12. Statements
4.13. Preprocessing Directives
4.14. Library Functions
4.15. Architecture
4.16. Locale-Specific Behavior
4.2. Environment
4.3. Identifiers
4.4. Characters
4.5. Integers
4.6. Floating Point
4.7. Arrays and Pointers
4.8. Hints
4.9. Structures, Unions, Enumerations, and Bit-Fields
5. C++ Implementation-Defined Behavior
5. C++ Implementation-Defined Behavior
5.1. Conditionally-Supported Behavior
5.2. Exception Handling
6. Extensions to the C Language Family
6. Extensions to the C Language Family
6.1. Statements and Declarations in Expressions
6.10. Complex Numbers
6.11. Additional Floating Types
6.12. Half-Precision Floating Point
6.13. Decimal Floating Types
6.14. Hex Floats
6.15. Fixed-Point Types
6.16. Named Address Spaces
6.17. Arrays of Length Zero
6.18. Structures with No Members
6.19. Arrays of Variable Length
6.2. Locally Declared Labels
6.20. Macros with a Variable Number of Arguments.
6.21. Slightly Looser Rules for Escaped Newlines
6.22. Non-Lvalue Arrays May Have Subscripts
6.23. Arithmetic on void- and Function-Pointers
6.24. Pointers to Arrays with Qualifiers Work as Expected
6.25. Non-Constant Initializers
6.26. Compound Literals
6.27. Designated Initializers
6.28. Case Ranges
6.29. Cast to a Union Type
6.3. Labels as Values
6.30. Mixed Declarations and Code
6.31. Declaring Attributes of Functions
6.32. Label Attributes
6.33. Attribute Syntax
6.34. Prototypes and Old-Style Function Definitions
6.35. C++ Style Comments
6.36. Dollar Signs in Identifier Names
6.37. The Character in Constants
6.38. Specifying Attributes of Variables
6.39. Specifying Attributes of Types
6.4. Nested Functions
6.40. Inquiring on Alignment of Types or Variables
6.41. An Inline Function is As Fast As a Macro
6.42. When is a Volatile Object Accessed?
6.43. How to Use Inline Assembly Language in C Code
6.43.1. Basic Asm
6.43.2. Extended Asm - Assembler Instructions with C Expression Operands
6.43.3. Constraints for asm Operands
6.43.3.1. Simple Constraints
6.43.3.2. Multiple Alternative Constraints
6.43.3.3. Constraint Modifier Characters
6.43.3.4. Constraints for Particular Machines
6.43.4. Controlling Names Used in Assembler Code
6.43.5. Variables in Specified Registers
6.43.5.1. Defining Global Register Variables
6.43.5.2. Specifying Registers for Local Variables
6.43.6. Size of an asm
6.44. Alternate Keywords
6.45. Incomplete enum Types
6.46. Function Names as Strings
6.47. Getting the Return or Frame Address of a Function
6.48. Using Vector Instructions through Built-in Functions
6.49. Support for offsetof
6.5. Constructing Function Calls
6.50. Legacy __sync Built-in Functions for Atomic Memory Access
6.51. Built-in Functions for Memory Model Aware Atomic Operations
6.52. Built-in Functions to Perform Arithmetic with Overflow Checking
6.53. x86-Specific Memory Model Extensions for Transactional Memory
6.54. Object Size Checking Built-in Functions
6.55. Pointer Bounds Checker Built-in Functions
6.56. Cilk Plus C/C++ Language Extension Built-in Functions
6.57. Other Built-in Functions Provided by GCC
6.58. Built-in Functions Specific to Particular Target Machines
6.58.1. AArch64 Built-in Functions
6.58.10. Blackfin Built-in Functions
6.58.11. FR-V Built-in Functions
6.58.11.1. Argument Types
6.58.11.2. Directly-Mapped Integer Functions
6.58.11.3. Directly-Mapped Media Functions
6.58.11.4. Raw Read/Write Functions
6.58.11.5. Other Built-in Functions
6.58.12. MIPS DSP Built-in Functions
6.58.13. MIPS Paired-Single Support
6.58.14. MIPS Loongson Built-in Functions
6.58.14.1. Paired-Single Arithmetic
6.58.14.2. Paired-Single Built-in Functions
6.58.14.3. MIPS-3D Built-in Functions
6.58.15. Other MIPS Built-in Functions
6.58.16. MSP430 Built-in Functions
6.58.17. NDS32 Built-in Functions
6.58.18. picoChip Built-in Functions
6.58.19. PowerPC Built-in Functions
6.58.2. Alpha Built-in Functions
6.58.20. PowerPC AltiVec Built-in Functions
6.58.21. PowerPC Hardware Transactional Memory Built-in Functions
6.58.22. RX Built-in Functions
6.58.23. S/390 System z Built-in Functions
6.58.24. SH Built-in Functions
6.58.25. SPARC VIS Built-in Functions
6.58.26. SPU Built-in Functions
6.58.27. TI C6X Built-in Functions
6.58.28. TILE-Gx Built-in Functions
6.58.29. TILEPro Built-in Functions
6.58.3. Altera Nios II Built-in Functions
6.58.30. x86 Built-in Functions
6.58.31. x86 Transactional Memory Intrinsics
6.58.4. ARC Built-in Functions
6.58.5. ARC SIMD Built-in Functions
6.58.6. ARM iWMMXt Built-in Functions
6.58.7. ARM C Language Extensions (ACLE)
6.58.8. ARM Floating Point Status and Control Intrinsics
6.58.9. AVR Built-in Functions
6.59. Format Checks Specific to Particular Target Machines
6.59.1. Solaris Format Checks
6.59.2. Darwin Format Checks
6.6. Referring to a Type with typeof
6.60. Pragmas Accepted by GCC
6.60.1. ARM Pragmas
6.60.10. Diagnostic Pragmas
6.60.11. Visibility Pragmas
6.60.12. Push/Pop Macro Pragmas
6.60.13. Function Specific Option Pragmas
6.60.14. Loop-Specific Pragmas
6.60.2. M32C Pragmas
6.60.3. MeP Pragmas
6.60.4. RS/6000 and PowerPC Pragmas
6.60.5. Darwin Pragmas
6.60.6. Solaris Pragmas
6.60.7. Symbol-Renaming Pragmas
6.60.8. Structure-Packing Pragmas
6.60.9. Weak Pragmas
6.61. Unnamed Structure and Union Fields
6.62. Thread-Local Storage
6.62.1. ISO/IEC 9899:1999 Edits for Thread-Local Storage
6.62.2. ISO/IEC 14882:1998 Edits for Thread-Local Storage
6.63. Binary Constants using the ‘0b’ Prefix
6.7. Conditionals with Omitted Operands
6.8. 128-bit Integers
6.9. Double-Word Integers
7. Extensions to the C++ Language
7. Extensions to the C++ Language
7.1. When is a Volatile C++ Object Accessed?
7.10. Type Traits
7.11. Java Exceptions
7.12. Deprecated Features
7.13. Backwards Compatibility
7.2. Restricting Pointer Aliasing
7.3. Vague Linkage
7.4. C++ Interface and Implementation Pragmas
7.5. Where's the Template?
7.6. Extracting the Function Pointer from a Bound Pointer to Member Function
7.7. C++-Specific Variable, Function, and Type Attributes
7.8. Function Multiversioning
7.9. Namespace Association
8. GNU Objective-C Features
8. GNU Objective-C Features
8.1. GNU Objective-C Runtime API
8.1.1. Modern GNU Objective-C Runtime API
8.1.2. Traditional GNU Objective-C Runtime API
8.10. Messaging with the GNU Objective-C Runtime
8.10.1. Dynamically Registering Methods
8.10.2. Forwarding Hook
8.2. +load: Executing Code before main
8.2.1. What You Can and Cannot Do in +load
8.3. Type Encoding
8.3.1. Legacy Type Encoding
8.3.2. @encode
8.3.3. Method Signatures
8.4. Garbage Collection
8.5. Constant String Objects
8.6. compatibility_alias
8.7. Exceptions
8.8. Synchronization
8.9. Fast Enumeration
8.9.1. Using Fast Enumeration
8.9.2. C99-Like Fast Enumeration Syntax
8.9.3. Fast Enumeration Details
8.9.4. Fast Enumeration Protocol
9. Binary Compatibility
9. Binary Compatibility
10. gcov
10. gcov
10.1. Introduction to gcov
10.2. Invoking gcov
10.3. Using gcov with GCC Optimization
10.4. Brief Description of gcov Data Files
10.5. Data File Relocation to Support Cross-Profiling
11. gcov-tool
11. gcov-tool
11.1. Introduction to gcov-tool
11.2. Invoking gcov-tool
12. Known Causes of Trouble
12. Known Causes of Trouble with GCC
12.1. Actual Bugs We Haven't Fixed Yet
12.2. Interoperation
12.3. Incompatibilities of GCC
12.4. Fixed Header Files
12.5. Standard Libraries
12.6. Disappointments and Misunderstandings
12.7. Common Misunderstandings with GNU C++
12.7.1. Declare and Define Static Members
12.7.2. Name Lookup, Templates, and Accessing Members of Base Classes
12.7.3. Temporaries May Vanish Before You Expect
12.7.4. Implicit Copy-Assignment for Virtual Bases
12.8. Certain Changes We Don't Want to Make
12.9. Warning Messages and Error Messages
1. Programming Languages Supported by GCC
Using the GNU Compiler Collection (GCC)
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