unsigned long long int specified in the C99 standard
unsigned long long long int is at least 64-bit in size and was specified in the C99 standard. It is the same as long long but unsigned.
Questions tagged [unsigned-long-long-int]
151 questions
5
votes
3 answers
64bit integer conversion from string
I'm dealing with the problem of reading a 64bit unsigned integer unsigned long long from a string. My code should work both for GCC 4.3 and Visual Studio 2010.
I read this question and answers on the topic: Read 64 bit integer string from file and…
Antonio Pérez
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5
votes
1 answer
Double to `unsigned long long` causes memory (stack?) corruption
What is wrong with the following code (crashes):
#include
#include
void foo(std::string str, unsigned long long val)
{
std::cout<< str<< " "<< val<< std::endl; // Crashes if commented as well
}
int main()
{
double d =…
Xyand
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4
votes
2 answers
Assigning length of a string to an integer: C++
Using C++, I want to create a for loop as follows (text is a std::string):
for(int i = text.size(); i >= 0; i--) {
{
Please could somebody help me understand why my complier (Xcode) requires me to initialise i as an unsigned long, and not as…
Ian Thompson
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4
votes
2 answers
How to convert a hex string to an unsigned long?
I have following hex value
CString str;
str = T("FFF000");
How to convert this in to an unsigned long?
Chris_vr
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4
votes
1 answer
How to determine the maximum value for which a program can calculate factorial using unsigned long long?
How to write a proper algorithm in C that determines the maximum value for which the program can calculate factorial using unsigned long long int?
My example does not work properly. Using Linux/64bit and GCC, it gives me 65 iterations.
#include…
Eifel
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- 7
4
votes
3 answers
Parsing 64-bit unsigned integer on iOS
I have very big unsigned integral number in NSString. This may be big to 2^64.
Is there an existing functions/classes parsing this?
As I know, it's unsigned long long value, but, It's hard to know what kind of method should I use to parse this.
eonil
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4
votes
2 answers
Check if unsigned long long is available
How can i check by a preprocessor directive if the type unsigned long long is available in the current build environment?
I tried checking
#if __STDC_VERSION__ >= 199901L
/* Available */
#else
/* Not available */
#endif
but compiling with…
urzeit
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4
votes
3 answers
unsigned int(32bit) to unsigned long long (64bit)
In the code below, I multiplied 0xffffffff by 2 for an unsigned int(32bit) and stored it in a unsigned long long(64bit). Why don't I get the actual output which is 8589934588. Instead I get 4294967294.
Thanks in advance.
OUTPUT:
Sizeof…
user2632477
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votes
1 answer
How to work on intergers as large as 2^9000000 in C++
The largest data type for positive integers I know of is unsigned long long. Is there a way to work on integers as large as 2^9000000 in C++.
I use gcc compiler in code-blocks but can also work on visual studio.
Usama Tahir
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3
votes
1 answer
unsigned long long VS unsigned long long int
I want to know the main difference with unsigned long long and unsigned long long int. Can they be used inter-changeably.
For calculations involving huge decimal numbers like 9223372036854775807, which one is preferred?
Thanks.
Safwan Ull Karim
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3
votes
1 answer
Compiler macro to test difference between uint64_t and unsigned long long int
I have C++11 code that is failing to compile because an overloaded function is redefined with the same types as arguments:
char const* foo(uint64_t) { return "%" PRIu64; }
char const* foo(unsigned long long int) { return "%llu"; }
Is there a…
Alex Reynolds
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3
votes
1 answer
Unsigned long long overflow error?
I have been having some strange issues with unsigned long long.
It happens when I set an unsigned long long (I used size_t, however the problem is repeatable with u-l-l). I have set it to 2^31, however for some reason it reverts to…
Dude Dude
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votes
3 answers
How can I seekg() files over 4GB on Windows?
I am on Windows 7, 64bit and NTFS.
I am building a DLL that must be 32 bit. I have a very simple routine that I'd like to implement in C++. I'm reading a large file using:
unsigned long p;
ifstream source(file);
streampos…
Josep Valls
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2
votes
2 answers
why is overload with unsigned __int64 and __int64 ambiguous
Using VS2008, why is this OK (not allowed to use 2010).
void assert(int exp, int actual) {if (exp!=actual) printf("assert failed\n");}
void assert(unsigned int exp, unsigned int actual) {if (exp!=actual) printf("assert failed\n");}
But this is…
Jim
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2
votes
0 answers
How to translate Python infinitely big integer into Cython?
I want to factorize very huge numbers (e.g. 100-bits, 200-bits numbers) with Cython.
Hi everyone, I implemented the Elliptic Curve Method for factorization into Python 3.6. Now, I want to speed up my code using Cython (version 29.13). I'm a beginner…
G.F
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