C++ Integer Constants Integer constants are constant data elements that have no fractional parts or exponents. They always begin with a digit. You can specify integer constants in decimal, octal, or hexadecimal form. They can specify signed or unsigned types and long or short types.Syntaxinteger-constant :decimal-constant integer-suffixopt octal-constant integer-suffixopt hexadecimal-constant integer-suffixopt 'c-char-sequence'decimal-constant :nonzero-digit decimal-constant digitoctal-constant :0 octal-constant octal-digithexadecimal-constant :0x hexadecimal-digit 0X hexadecimal-digit hexadecimal-constant hexadecimal-digitnonzero-digit : one of1 2 3 4 5 6 7 8 9octal-digit : one of0 1 2 3 4 5 6 7hexadecimal-digit : one of0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E Finteger-suffix :unsigned-suffix long-suffixopt long-suffix unsigned-suffixoptunsigned-suffix : one ofu Ulong-suffix : one ofl L64-bit integer-suffix :i64To specify integer constants using octal or hexadecimal notation, use a prefix that denotes the base. To specify an integer constant of a given integral type, use a suffix that denotes the type.To specify a decimal constant, begin the specification with a nonzero digit. For example:int i = 157; // Decimal constant int j = 0198; // Not a decimal number; erroneous octal constant int k = 0365; // Leading zero specifies octal constant, not decimalTo specify an octal constant, begin the specification with 0, followed by a sequence of digits in the range 0 through 7. The digits 8 and 9 are errors in specifying an octal constant. For example:int i = 0377; // Octal constant int j = 0397; // Error: 9 is not an octal digitTo specify a hexadecimal constant, begin the specification with 0x or 0X (the case of the “x” does not matter), followed by a sequence of digits in the range 0 through 9 and a (or A) through f (or F). Hexadecimal digits a (or A) through f (or F) represent values in the range 10 through 15. For example:int i = 0x3fff; // Hexadecimal constant int j = 0X3FFF; // Equal to iTo specify an unsigned type, use either the u or U suffix. To specify a long type, use either the l or L suffix. For example:unsigned uVal = 328u; // Unsigned value long lVal = 0x7FFFFFL; // Long value specified // as hex constant unsigned long ulVal = 0776745ul; // Unsigned long value
for(lAdd = 4i64*1024i64*1024i64;lAdd < 2i64*1024i64*1024i64*1024i64 ;lAdd += (4i64*1024i64))
{if( lAdd<(__int64)iVal) lAdd += (1i64*1024i64*1024i64)-(4i64*1024i64);
}
Integer constants are constant data elements that have no fractional parts or exponents. They always begin with a digit. You can specify integer constants in decimal, octal, or hexadecimal form. They can specify signed or unsigned types and long or short types.Syntaxinteger-constant :decimal-constant integer-suffixopt
octal-constant integer-suffixopt
hexadecimal-constant integer-suffixopt
'c-char-sequence'decimal-constant :nonzero-digit
decimal-constant digitoctal-constant :0
octal-constant octal-digithexadecimal-constant :0x hexadecimal-digit
0X hexadecimal-digit
hexadecimal-constant hexadecimal-digitnonzero-digit : one of1 2 3 4 5 6 7 8 9octal-digit : one of0 1 2 3 4 5 6 7hexadecimal-digit : one of0 1 2 3 4 5 6 7 8 9
a b c d e f
A B C D E Finteger-suffix :unsigned-suffix long-suffixopt
long-suffix unsigned-suffixoptunsigned-suffix : one ofu Ulong-suffix : one ofl L64-bit integer-suffix :i64To specify integer constants using octal or hexadecimal notation, use a prefix that denotes the base. To specify an integer constant of a given integral type, use a suffix that denotes the type.To specify a decimal constant, begin the specification with a nonzero digit. For example:int i = 157; // Decimal constant
int j = 0198; // Not a decimal number; erroneous octal constant
int k = 0365; // Leading zero specifies octal constant, not decimalTo specify an octal constant, begin the specification with 0, followed by a sequence of digits in the range 0 through 7. The digits 8 and 9 are errors in specifying an octal constant. For example:int i = 0377; // Octal constant
int j = 0397; // Error: 9 is not an octal digitTo specify a hexadecimal constant, begin the specification with 0x or 0X (the case of the “x” does not matter), followed by a sequence of digits in the range 0 through 9 and a (or A) through f (or F). Hexadecimal digits a (or A) through f (or F) represent values in the range 10 through 15. For example:int i = 0x3fff; // Hexadecimal constant
int j = 0X3FFF; // Equal to iTo specify an unsigned type, use either the u or U suffix. To specify a long type, use either the l or L suffix. For example:unsigned uVal = 328u; // Unsigned value
long lVal = 0x7FFFFFL; // Long value specified
// as hex constant
unsigned long ulVal = 0776745ul; // Unsigned long value