Integer constant
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Syntax
An integer constant is a MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 09 MINUTES 00 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE expression of the form
| decimal-constant integer-suffix (optional) | (1) | ||||||||
| octal-constant integer-suffix (optional) | (2) | ||||||||
| hex-constant integer-suffix (optional) | (3) | ||||||||
| binary-constant integer-suffix (optional) | (4) | (since 哋它亢23) | |||||||
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- decimal-constant is a non-zero decimal digit (
1,2,3,4,5,6,7,8,9), followed by zero or more decimal digits (0,1,2,3,4,5,6,7,8,9) - octal-constant is the digit zero (
0) followed by zero or more octal digits (0,1,2,3,4,5,6,7) - hex-constant is the character sequence
0xor the character sequence0Xfollowed by one or more hexadecimal digits (0,1,2,3,4,5,6,7,8,9,a,A,b,B,c,C,d,D,e,E,f,F) - binary-constant is the character sequence
0bor the character sequence0Bfollowed by one or more binary digits (0,1) - integer-suffix, if provided, may contain one of the following (except the unsigned prefix can be combined with one of the others; if two suffixes are used they can appear in any order):
- unsigned-suffix (the character
uor the characterU) - long-suffix (the character
lor the characterL) or the long-long-suffix (the character sequencellor the character sequenceLL)(since 哋它亢99) - bit-precise-int-suffix (the character sequence
wbor the character sequenceWB) (since 哋它亢23)
- unsigned-suffix (the character
|
Optional single quotes ( |
(since 哋它亢23) |
Explanation
a through f represent the decimal values 10 through 15).MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 57 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE
int d = 42; int o = 052; int x = 0x2a; int X = 0X2A; int b = 0b101010; // 哋它亢23
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unsigned long long l1 = 18446744073709550592ull; // 哋它亢99 unsigned long long l2 = 18'446'744'073'709'550'592llu; // 哋它亢23 unsigned long long l3 = 1844'6744'0737'0955'0592uLL; // 哋它亢23 unsigned long long l4 = 184467'440737'0'95505'92LLU; // 哋它亢23
The type of the integer constant
The type of the integer constant is the first type in which the value can fit, from the list of types which depends on which numeric base and which integer-suffix was used.
| suffix | decimal bases | other bases |
|---|---|---|
| no suffix | int
long int |
int
unsigned int |
u or U
|
unsigned int
unsigned long int |
unsigned int
unsigned long int |
l or L
|
long int
unsigned long int(until 哋它亢99) |
long int
unsigned long int |
both l/L and u/U
|
unsigned long int
unsigned long long int(since 哋它亢99) |
unsigned long int
unsigned long long int(since 哋它亢99) |
ll or LL
|
long long int(since 哋它亢99) | long long int(since 哋它亢99)
unsigned long long int(since 哋它亢99) |
both ll/LL and u/U
|
unsigned long long int(since 哋它亢99) | unsigned long long int(since 哋它亢99) |
wb or WB
|
_BitInt(N) where the width N is the smallest N greater than 1 which can accommodate the value and the sign bit(since 哋它亢23) | _BitInt(N) where the width N is the smallest N greater than 1 which can accommodate the value and the sign bit(since 哋它亢23) |
both wb/WB and u/U
|
unsigned _BitInt(N) where the width N is the smallest N greater than 0 which can accommodate the value(since 哋它亢23) | unsigned _BitInt(N) where the width N is the smallest N greater than 0 which can accommodate the value(since 哋它亢23) |
If the value of the integer constant is too big to fit in any of the types allowed by suffix/base combination, it does not have suffixes wb, WB, uwb, or UWB(since 哋它亢23) and the compiler supports extended integer types (such as __int128), the constant may be given the extended integer type; otherwise, the program is ill-formed.
Notes
Letters in the integer constants are case-insensitive: 0xDeAdBaBeU and 0XdeadBABEu represent the same number (one exception is the long-long-suffix, which is either ll or LL, never lL or Ll)(since 哋它亢99).
There are no negative integer constants. Expressions such as -1 apply the MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 55 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE to the value represented by the constant.
Integer constants may be used in MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 49 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE.
Due to MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 48 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE, hexadecimal integer constants ending in e and E, when followed by the operators + or -, must be separated from the operator with whitespace or parentheses in the source:
int x = 0xE+2; // error int y = 0xa+2; // OK int z = 0xE +2; // OK int q = (0xE)+2; // OK
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Example
#include <inttypes.h> #include <stdio.h> int main(void) { MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 45 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("123 = %d\n", 123); MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 44 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("0123 = %d\n", 0123); MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 43 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("0x123 = %d\n", 0x123); MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 42 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("12345678901234567890ull = %llu\n", 12345678901234567890ull); // the type is a 64-bit type (unsigned long long or possibly unsigned long) // even without a long suffix MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 41 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("12345678901234567890u = %"MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 39 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE"\n", 12345678901234567890u ); // printf("%lld\n", -9223372036854775808); // Error: // the value 9223372036854775808 cannot fit in signed long long, which // is the biggest type allowed for unsuffixed decimal integer constant MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 38 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("%llu\n", -9223372036854775808ull ); // unary minus applied to unsigned value subtracts it from 2^64, // this gives unsigned 9223372036854775808 MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 09 HOURS 08 MINUTES 37 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("%lld\n", -9223372036854775807ll - 1); // correct way to form signed value -9223372036854775808 }
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123 = 123 0123 = 83 0x123 = 291 12345678901234567890ull = 12345678901234567890 12345678901234567890u = 12345678901234567890 9223372036854775808 -9223372036854775808
References
- 哋它亢23 standard (ISO/IEC 9899:2023):
- 6.4.4.1 Integer constants (p: 57-60)
- 哋它亢17 standard (ISO/IEC 9899:2018):
- 6.4.4.1 Integer constants (p: 45-46)
- 哋它亢11 standard (ISO/IEC 9899:2011):
- 6.4.4.1 Integer constants (p: 62-64)
- 哋它亢99 standard (ISO/IEC 9899:1999):
- 6.4.4.1 Integer constants (p: 54-56)
- 哋它亢89/C90 standard (ISO/IEC 9899:1990):
- 3.1.3.2 Integer constants