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binary numberhow to specifiy a binary number in c++?
hex numbers are specified by 0x prefix |

Re: binary number" Bern" <x@x.com> wrote...
> how to specifiy a binary number in c++? > > hex numbers are specified by 0x prefix There is no standard syntax for binary numbers. V |

Re: binary numberBern wrote:
> how to specifiy a binary number in c++? > > hex numbers are specified by 0x prefix > > Specifying binary numbers hampers readability of the code. In fact, though you can specify octal constants in C++ code ( 0 prefix), for all practical purposes use hex numbers since people can understand / read it better when written that way. -- Karthik. |

Re: binary number" Bern" <x@x.com> wrote in message news:41355ce2$1@news.starhub.net.sg... > how to specifiy a binary number in c++? > > hex numbers are specified by 0x prefix There's no language support for binary literals. Many programmers use hexadecimal 0x0001, 0x0002, 0x0004, ... 0x8000 to define bits, and then operator|() (a.k.a. operator bit_or) to construct the actual number from separate bits. Another less common but easier way for some is to use octal (whose prefix is plain '0'), which is a bit easier to cope with than hexadecimal numbers. [By the way, C and C++ are perhaps the only programming languages having no token representing decimal zero! :-] - Risto - |

Re: binary numberRisto Lankinen wrote:
> > [By the way, C and C++ are perhaps the only programming languages > having no token representing decimal zero! :-] > > - Risto - > > what would the token 0 be, then? |

Re: binary number"red floyd" <no.spam@here.dude> wrote in message news:KWmZc.14518$AX6.13446@newssvr29.news.prodigy. com... > Risto Lankinen wrote: > > > > [By the way, C and C++ are perhaps the only programming languages > > having no token representing decimal zero! :-] > > > > - Risto - > > > > > > what would the token 0 be, then? Octal zero. (it begins with the '0' character). -Mike |

Re: binary numberMike Wahler wrote:
> > "red floyd" <no.spam@here.dude> wrote in message > news:KWmZc.14518$AX6.13446@newssvr29.news.prodigy. com... >> Risto Lankinen wrote: >> > >> > [By the way, C and C++ are perhaps the only programming languages >> > having no token representing decimal zero! :-] >> > >> > - Risto - >> > >> > >> >> what would the token 0 be, then? > > Octal zero. (it begins with the '0' character). > > > > -Mike I am confused? What exactly is the difference between the numerical constant 0_8 denoted by the string "0" in octal notation versus the numerical constant 0_10 denoted by the string "0" is decimal notation (as existent in other languages). In particular, what is 0_8 - 0_10 Best Kai-Uwe Bux |

Re: binary number"Kai-Uwe Bux" <jkherciueh@gmx.net> wrote in message news:ch5ea1$6t7$1@murdoch.acc.Virginia.EDU... > >> what would the token 0 be, then? > > > > Octal zero. (it begins with the '0' character). > > -Mike > > I am confused? > > What exactly is the difference between the numerical constant 0_8 denoted > by the string "0" in octal notation versus the numerical constant 0_10 > denoted by the string "0" is decimal notation (as existent in other > languages). In particular, what is > > 0_8 - 0_10 > Kai-Uwe Bux That's a VERY confusing question. Your terminology and representations are difficult to comprehend. But I'll try to address what I THINK you're asking: There is no difference in the value STORED when you write any if the following: int hexInt = 0x08; int octInt = 08; int decInt = 8; Those are all representations of the number eight. The only difference is what your source code looks like, not what results after compiling. The integer literal 0, according to the grammar, is an octal representation of the value zero. You could also say 0x0 (or 0x00000000, for that matter), using the hexadecimal representation for zero, but it's still the value zero. And there IS NO saparate notation for the value zero represented as a decimal, because that would be the same as the octal representation, namely 0. When you write "int x = 0;", you're just assigning the VALUE zero to the variable x. It's irrelevant whether the literal 0 is an octal or decimal representation. It's still just zero! (I suppose, the grammar COULD have been defined so that 00 was the octal representation for zero, and 0 was the decimal representation, but that's not the way it WAS defined, and it really doesn't matter at all.) -Howard |

Re: binary number"Kai-Uwe Bux" <jkherciueh@gmx.net> wrote in message
news:ch5ea1$6t7$1@murdoch.acc.Virginia.EDU... > Mike Wahler wrote: > > > > > "red floyd" <no.spam@here.dude> wrote in message > > news:KWmZc.14518$AX6.13446@newssvr29.news.prodigy. com... > >> Risto Lankinen wrote: > >> > > >> > [By the way, C and C++ are perhaps the only programming languages > >> > having no token representing decimal zero! :-] > >> > > >> > - Risto - > >> > > >> > > >> > >> what would the token 0 be, then? > > > > Octal zero. (it begins with the '0' character). > > > > > > > > -Mike > > I am confused? Perhaps. > What exactly is the difference between the numerical constant 0_8 denoted 0_8 is not a numerical constant. It's not a valid C++ token at all. > by the string "0" A string is not a numeric literal, it's a string literal. > in octal notation In C++, octal notation is expressed by the first digit being zero. >versus the numerical constant 0_10. 0_10 is not a numerical constant. It's not a valid C++ token at all. > denoted by the string "0" A string is not a numeric literal, it's a string literal. > is decimal notation In C++, decimal notation is expressed by the first digit being 1, 2, 3, 4, 5, 6, 7, 8, or 9 >(as existent in other > languages). This is C++, not other languages. >In particular, what is > > 0_8 - 0_10 From a C++ perspective, it's gibberish. From the C++ standard: ================= begin quote ================ ISO/IEC 14882:1998(E) 2.13.1 Integer literals integer*-literal: decimal*-literal integer*-suffix opt octal*-literal integer*-suffix opt hexadecimal-*literal integer*-suffix opt decimal-*literal: nonzero-*digit decimal-*literal digit octal*-literal: 0 octal*-literal octal*-digit hexadecimal*-literal: 0x hexadecimal-*digit 0X hexadecimal-*digit hexadecimal-*literal hexadecimal-*digit nonzero*-digit: one of 1 2 3 4 5 6 7 8 9 octal-*digit: one of 0 1 2 3 4 5 6 7 hexadecimal*-digit: one of 0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F integer-*suffix: unsigned*-suffix long*s-uffix opt long*-suffix unsigned*-suffix opt unsigned-*suffix: one of u U long*-suffix: one of l L 1 An integer literal is a sequence of digits that has no period or exponent part. An integer literal may have a prefix that specifies its base and a suffix that specifies its type. The lexically first digit of the sequence of digits is the most significant. A decimal integer literal (base ten) begins with a digit other than 0 and consists of a sequence of decimal digits. An octal integer literal (base eight) begins with the digit 0 and consists of a sequence of octal digits. (22) A hexadecimal integer literal (base sixteen) begins with 0x or 0X and consists of a sequence of hexadecimal digits, which include the decimal digits and the letters a through f and A through F with decimal values ten through fifteen. [Example: the number twelve can be written 12, 014, or 0XC. ] 2 The type of an integer literal depends on its form, value, and suffix. If it is decimal and has no suffix, it has the first of these types in which its value can be represented: int, long int; if the value cannot be represented as a long int, the behavior is undefined. If it is octal or hexadecimal and has no suffix, it has the first of these types in which its value can be represented: int, unsigned int, long int, unsigned long int. If it is suffixed by u or U, its type is the first of these types in which its value can be represented: unsigned int, unsigned long int. If it is suffixed by l or L, its type is the first of these types in which its value can be represented: long int, unsigned long int. If it is suffixed by ul, lu, uL, Lu, Ul, lU, UL, or LU, its type is unsigned long int. 3 A program is ill*formed if one of its translation units contains an integer literal that cannot be represented by any of the allowed types. (21) The term "literal" generally designates, in this International Standard, those tokens that are called "constants" in ISO C. (22) The digits 8 and 9 are not octal digits. ================= end quote ================== The base of literal 0 doesn't really matter, since zero is zero, whatever the base. -Mike |

Re: binary numberRisto Lankinen wrote:
> " Bern" <x@x.com> wrote in message news:41355ce2$1@news.starhub.net.sg... > >>how to specifiy a binary number in c++? >> >>hex numbers are specified by 0x prefix There were some excellent macros posted to comp.lang.c a while ago: http://groups.google.com/groups?selm...gle.com&rnum=1 that let you define binary constants like B8(01001010) > Another less common but easier way for some is to use octal (whose > prefix is plain '0'), which is a bit easier to cope with than hexadecimal > numbers. I always found octal harder than hex. :/ I guess mainly 'cuz I'm used to grouping my binary numbers in bundles of 4 (or powers of 2) rather than bundles of 3 bits. > [By the way, C and C++ are perhaps the only programming languages > having no token representing decimal zero! :-] "0." -josh |

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