How do you format an unsigned long long int using printf? I don't have GCC handy but you could check the stdint header. Connect and share knowledge within a single location that is structured and easy to search. Force gcc to treat long as a int32_t on 64bit? Basically, because your literal is decimal and doesn't have a suffix, it tries to fit into the following types: Since it won't fit into long long int, you're getting the warning you're getting. . unsigned long long int for an unsigned integer. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. -m64. Mimick C++ nested structs with union in C#. I am working ATMEL studio 7.0 for ARM cortex-M0+. Name of a play about the morality of prostitution (kind of). Fixed-point types are supported by the DWARF debug information format. Now do your part and report any bugs or deficiencies here . rev2022.12.9.43105. unsigned long long merge (unsigned long long a, unsigned long long b) {// merge(12, 34) => 1234: unsigned long long shift = 10; while (shift <= b) shift *= 10; return a * shift + b;} // true if a and b can be merged in any way and the result is still a prime: bool match (unsigned long long a, unsigned long long b) {return isPrime (merge (a, b . Long Long - Using the GNU Compiler Collection (GCC) 5.8 Double-Word Integers ISO C99 supports data types for integers that are at least 64 bits wide, and as an extension GCC supports them in C89 mode and in C++. Visual Studio for instance has an unconditional. unsigned long long(10) fails to compile on clang and gcc. /* Maximum value an `unsigned long long int' can hold. When would I give a checkpoint to my D&D party that they can return to if they die? MOSFET is getting very hot at high frequency PWM. */ # undef ULLONG_MAX # define ULLONG_MAX (LLONG_MAX * 2ULL + 1ULL) . However, when the following code is compiled with the -Wall flag it gives the warning [Wimplicitly-unsigned-literal]: If I use 263-1 (9223372036854775807) instead, it compiles with no warnings (as expected - 263-1 will fit in a signed long int). Connect and share knowledge within a single location that is structured and easy to search. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? In order to accommodate you, the compiler is making its type unsigned long. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Thus in _Generic it will match unsigned int for clang, but not GCC. This is the minimum value that can be represented by a signed long int. What is the conversion specifier for printf that formats a long? Programming . Can virent/viret mean "green" in an adjectival sense? Don't assume it's true everywhere. Does balls to the wall mean full speed ahead or full speed ahead and nosedive? Check out the promotion table for integer literals in my answer. This will always be true if size_t is no bigger than. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? Sheesh. GCC Bugzilla - Bug 107405 [13 Regression] enum change causing Linux kernel to fail to build due to Linux . By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Is it a gcc setting, inclusion of another header . Find centralized, trusted content and collaborate around the technologies you use most. In C prior to C99 (but not in C++), unsuffixed decimal values that do not fit in long int are allowed to have the type unsigned long int. Ready to optimize your JavaScript with Rust? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I can't force other members of my team, or library authors to do the same. unsigned long. I don't know how to answer your question. @LuVnhPhc As the OP mentioned gcc in his message, I assumed that he was building on an Unix-like platform (which are LP64). Add a new light switch in line with another switch? unsigned long long test64= 0x123456789ABCDEF0; // 8 bytes long. Looks like the C FE somehow munges the uLL constant. While when we try the 32 bit mode, it reports "previous definition" for above two classes. Forcing it at the compiler level (if at all possible) seems safer. unsigned long; even if size_t is bigger than unsigned long, it will be. With Microsoft compilers, long is always an int32_t, regardless of 32/64-bit. Why is the federal judiciary of the United States divided into circuits? My teacher then suggested that I could use the ULONG_MAX defined in limits.h and this gave no warnings. To make an integer constant of type long long int, add the suffix LL to the integer. To make an integer constant of type unsigned long Why is this usage of "I've to work" so awkward? ( ( (unsigned long long) ~0ULL) << shiftby)); } gcc file.c t2.c: In function `main': t2.c:7: warning: left shift count >= width of type <IMPORTANT> Value (using hardcoded 64) : 0 Value (w/o hardcoded 64) : ffffffffffffffff </IMPORTANT> Why is the behavior different if we try to shift value by 64 bits using a variable as against direct numeric "64"? Four data models found wide acceptance: 32 bit systems: LP32 or 2/4/4 (int is 16-bit, long and pointer are 32-bit) Win16 API. Why is apparent power not measured in Watts? The types int32_t and uint32_t have been changed from the previous int and unsigned int to long and unsigned long respectively for the Xtensa compiler. Because (2^8) - 1 = 256 - 1 = 255. score:21. Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? Books that explain fundamental chess concepts, Effect of coal and natural gas burning on particulate matter pollution. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? Force gcc to treat long as a int64_t, on 32bit? It will really save you a lot of hassle when compiling on random-platform-with-random-compiler-47.4. Can virent/viret mean "green" in an adjectival sense? Ready to optimize your JavaScript with Rust? The choice is arbitrary; all that's required is that it has to be a 64-bit type. Does a 120cc engine burn 120cc of fuel a minute? From: Geoff Keating <geoffk@geoffk.org> To: Mark Mitchell <mark@codesourcery.com> Cc: Alexandre Oliva <aoliva@redhat.com>, rth@redhat.com, gcc-patches@gcc.gnu.org Subject: Re: don't assume pointer cast to unsigned long is a valid initializer Date: Sat, 01 Mar 2003 01:59:00 -0000 [thread overview] Message-ID: <jmfzq7x2xo.fsf@desire.geoffk.org> () In-Reply-To: <1046482583.4831.206.camel . Hi all, the very same code that works with XC8 fails with the XC32-gcc (V2.40). My C program stops when iteration variable reaches 2100 why? Not the answer you're looking for? 9502 - shift of long long broken GCC Bugzilla - Bug 9502 shift of long long broken Last modified: 2003-07-25 17:33:46 UTC Bug 9502 - shift of long long broken Attachments Add an attachment (proposed patch, testcase, etc.) Because this huge value is the maximum value of an unsigned long long. The rubber protection cover does not pass through the hole in the rim. The document DS51685, page 45, says this works. char ranges from : -128 to 127 short char ranges from : -128 to 127 unsigned char ranges from : 0 to 255 short int ranges from : -32768 to 32767 unsigned short int ranges from : 0 to 65535 int ranges from : -2147483648 to 2147483647 unsigned int ranges from : 0 to 4294967295 long int ranges from : -9223372036854775808 to 9223372036854775807 unsigned long int ranges from : 0 to . Asking for help, clarification, or responding to other answers. @John: if your team members are writing fragile/unsafe/non-portable code then you need to fix them and/or their code. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. It does however install /usr/local/bin/gcc48 and /usr/local/bin/g++48. Did the apostolic or early church fathers acknowledge Papal infallibility? 2. by default -std=gnu99 is set in compiler settings. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, I am pretty sure you have to use parentheses around the c-style cast, as in, @NikhilChatterjee I've tried parens around the whole expression and that didn't work so I thought it can't be parens, lol, @Timo You would need parenthesis around the, @RemyLebeau yeah I've read your answer, thank you :D. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. The long (signed or unsigned) is a t least 32 bits in size, the long long at least 64 bits. If a function In this case, a u is sufficient; as with unsuffixed types, the compiler will decide whether to use unsigned int, unsigned long int, or unsigned long long int depending on the magnitude of the number and the capabilities of the types. How many transistors at minimum do you need to build a general-purpose computer? cout << "str " << str << endl; cout << "base " << base << endl; cout << "decimal " << l << endl; cout << "hex " << hex << l << endl; We use template specialization for some type parameter like. Thanks . Use strtoul to convert a hex string to an unsigned long: return strtoul (str, NULL, 16); Then the return value will be correct, but to display it in hex you need to use the correct type specifier: printf ("Le PC en HEX est: %lx\n", pc_hex); Also, to display it in decimal you should use the %lu specifier for an unsigned long, not %ld. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? Looking for a function that can squeeze matrices. clang constexpr compile error in lambda, gcc and msvc ok. clang bug? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. positive numbers and zero. Did the apostolic or early church fathers acknowledge Papal infallibility? . This expression works on every conforming implementation of C. That includes both value bits and. Why does the order in which libraries are linked sometimes cause errors in GCC? Appropriate translation of "puer territus pedes nudos aspicit"? make-libstdc++ change is necessary, it seems prudent to go ahead and. On 32-bit, long int is at least int32_t. For such types, you would need to use a C-style or C++-style cast instead, eg: Note, the header may have a uint64_t type you can use, eg: That being said, for integer literals, you can alternatively use the ULL suffix (C++11 and later), eg: Thanks for contributing an answer to Stack Overflow! Atomic function pointer call compiles in gcc, but not in clang and msvc. 2. ux uy 1 ux 1 uint64_t (x) 32 0 int64_t (int32_t (ux)) 32 1. I think that concludes this issue. The operations that are not open-coded use Likewise, if the function expects long long int and you pass Does the collective noun "parliament of owls" originate in "parliament of fowls"? How can I use a VPN to access a Russian website that is banned in the EU? If you see the "cross", you're on the right track. Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? gcc.gnu.org r/cpp Upcoming talk by Bjarne Stroustrup "What is good C++ code?" . expects type int for its argument, and you pass a value of type Addition, subtraction, and bitwise boolean operations on these types I am on a Gentoo Linux box, 2.6.17 kernel, using gcc 3.41 I haven't been able to find out how to get these conditions evaluate to be true. That means you can simply call rand () and use that value. Does a 120cc engine burn 120cc of fuel a minute? You can use these types in arithmetic like any other integer types. @NikosC. If you have a modern, 64-bit system, that probably means 64-bit ints (and unsigned ints), so you can just use unsigned int instead of unsigned long long. How can I use a VPN to access a Russian website that is banned in the EU? Are defenders behind an arrow slit attackable? It doesn't have ANY definition for ULLONG_MAX under the C++, while it does under C Both C and C++ do, however, have a definition for __UINT64_MAX__ , so I used it to define ULLONG_MAX Of course, the TI 17.3 compiler freaks out at that. { A = (int) 0xffffffff, B = -2 }; etc. More here: https://en.wikipedia.org/wiki/C_. ; A maximum integer value that can be stored in an unsigned long long int data type is 18, 446, 744, 073, 709, 551, 615, around 2 64 - 1(but is compiler dependent). It takes a size of 32 bits. The total number of bits in an unsigned long object is sizeof (unsigned long)*CHAR_BIT. long long ( unsigned long long) If its name begins with two underscores ( __ ), a data type is non-standard. Compatibility Ready to optimize your JavaScript with Rust? With GCC, long integers are normally 32 bits long and long long integers are 64 bits long, but it varies with the computer hardware and implementation of GCC, so check your system's documentation. On most machines that the GNU C Library runs on, long integers are 32-bit quantities, the same size as int . as this invokes undefined behavior by breaking 6.5.7p4 regardless of whether a warning is generated or not. to the integer. No, what you have shown should NOT compile. Add a new light switch in line with another switch? are not met. when left-shifting a bit-field of type unsigned long, the uppermost bits of the result can be 0 for . An unsigned data type stores only positive values. unsigned long long is guaranteed to be at least 64 bits, regardless of the platform. unsigned long test32= 0x12345678; // 4 bytes long. Is there a verb meaning depthify (getting more depth)? Why does GCC generate 15-20% faster code if I optimize for size instead of speed? Appropriate translation of "puer territus pedes nudos aspicit"? The text was updated successfully, but these errors were encountered: (for ease of testing). The C standard states that a long int is at least 4 bytes - on my system it is 8 bytes. The following code is rejected by both clang and gcc but accepted by msvc: error: expected primary-expression before 'unsigned'. In 64-bit mode, it defines uint64_t as unsigned long. 3. Allow non-GPL plugins in a GPL main program. In this case, no harm is caused, because you are assigning the value to an unsigned long. In 32-bit mode, the compiler (more precisely the header) defines uint64_t as unsigned long long, because unsigned long isn't wide enough. To learn more, see our tips on writing great answers. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to connect 2 VMware instance running on same Linux host machine via emulated ethernet cable (accessible via mac address)? How to set a newcommand to be incompressible by justification? Both will guess the language on the basis of the file-extension, unless overridden. LP64 for most *nix platforms, Mac OS X, etc) is a given, so even if you could convince the compiler to use a different 64-bit model you would probably break any calls to system code, libraries, etc. What is the difference between g++ and gcc? "ISO C90 doesn't support unsigned long long". Not the answer you're looking for? Is there any way to: Force gcc to treat long as a int64_t, on 32bit? are open-coded on all types of machines. The keyword unsigned is a data type specifier, which only represents non-negative integers i.e. 1. ux uy 0 signed_high_prod . Note You need to log in before you can comment on or make changes to this bug. gcc is the GCC compiler-driver for C programs, g++ is the one for C++ programs. When would I give a checkpoint to my D&D party that they can return to if they die? Built-in Function: double __builtin_powi (double, int) Some properties of the unsigned int data type are: An unsigned data type can only store positive values. Does a 120cc engine burn 120cc of fuel a minute? MOSFET is getting very hot at high frequency PWM. Making statements based on opinion; back them up with references or personal experience. Like an unsigned int, an unsignedlonglongwon't store negative numbers; it is also subject to the same overflow issuesas any integral data type. Find centralized, trusted content and collaborate around the technologies you use most. I want to input & output an unsigned long long int variable, but printf/sscanf seems to interpret the least significant 32 bits only. Simply write long long int for a signed integer, or unsigned long long int for an unsigned integer. In 64-bit mode, both are probably 64 bits. If not, you need to know whether you have 32-bit ints or 16-bit (e.g. Better way to check if an element only exists in one array, Effect of coal and natural gas burning on particulate matter pollution. Accepted answer. strtoul returns a 'long', not a 'long long' unsigned. Multiplication is open-coded Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Are defenders behind an arrow slit attackable? Why does C++ allow us to surround the variable name in parentheses when declaring a variable? GCC considers it to be 'bit-field of type unsigned int of specified width'. K kpa Jul 16, 2015 #5 Yes that's according to the policy of not installing binaries with same names there could be in the base system, FreeBSD 8 and 9 still have /usr/bin/gcc|g++|etc. Or if you want the whole enum to have some other type (unsigned int, long, unsigned long, long long, unsigned long long), use similar casts and/or constant suffixes. This is why its generally much easier to use a set of typedefs that are defined per platform. instruction. So unsigned long long is the same as uint64_t in the 32-bit compilation but not in 64-bit compilation? @MSalters: To be clear, all the predefined types are distinct, regardless of their representation. Not true. Maximum value for an object of type unsigned long long int: 18446744073709551615 (2 64-1) or greater* * the actual value depends on the particular system and library implementation, but shall reflect the limits of these types in the target platform. Is it appropriate to ignore emails from a student asking obvious questions? Not sure if it was just me or something she sent to the whole team. if the machine supports a fullword-to-doubleword widening multiply Connect and share knowledge within a single location that is structured and easy to search. ISO C99 supports data types for integers that are at least 64 bits wide, and as an extension GCC supports them in C89 mode and in C++. On gcc and clang, some of the functionality described here requires linking against -latomic . Why does the USA not have a constitutional court? It could have defined it as unsigned long long in both modes. Alternatively, you can turn the warning off by switching to an octal or hexadecimal literal: as per the linked table, which again, allows them to fit into the first 64-bit large unsigned type (usually unsigned long int). Simply write long long int for a signed integer, or unsigned long long int for an unsigned integer. What is the difference between g++ and gcc? If you upgrade to a current version of gcc and supplied libraries, remove the typedef for int64_t from your code and add #include <stdint.hto the top of your code. You can't assume that any of them are distinct from the predefined types. In 32-bit mode, the compiler (more precisely the <stdint.h> header) defines uint64_t as unsigned long long, because unsigned long isn't wide enough. LLONG_MIN (for ease of testing) Something can be done or not a fit? So the unsigned int ll be only. Since mips pointers sign extend, we have: (unsigned long) &_text = 0xffffffff80100000L so if the value was calculated at run time, we'd have: (unsigned long) &_text - 0x10000000L - 1 = 0xffffffff700fffffL Geoff seems to be suggesting that we use R_MIPS_64 for this value, but the ELF32 R_MIPS_64 is a sign-extending 32-bit relocation, not a full . Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! unsigned long is guaranteed to be at least 32 bits. Received a 'behavior reminder' from manager. Code: p=malloc (3); *p=0x3ffffffffffffff1; printf ("%x ",*p); To start with, the first line is only allocating 3 bytes to store your long (8 bytes). Bracers of armor Vs incorporeal touch attack. fancy table from the standard (6.4.4.1p5). Is it possible to generate uint64_t random numbers on GPU? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. (Minimum is 0). As of January 15, 2018, Site fix-up work has begun! Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs, std::rbegin and std::rend function in GCC 4.9 and clang 3.5, Clang doesn't compile code but gcc and msvc compiled it, GCC disagrees with Clang and MSVC when concept that's always true is used to implement a concept. 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