The `long long` size modifier was introduced in C++11 and can be used with integral types to select an integer of at least 64 bits.
See cppreference for more information.
Questions tagged [long-long]
131 questions
0
votes
1 answer
Multiplication of large numbers yields wrong value
I have the code
long long x = 200000 * 200000;
cout << x << endl;
it outputs 1345294336
I've tried converting to a string and outputting each digit, and it still outputs the same thing
Alexander Yang
- 25
- 2
0
votes
0 answers
Why gdb cast output truncated once input exceed int max?
Example of p/x:
(gdb) p/x (long long)-2147483647 #still works
$1 = 0xffffffff80000001
(gdb) p/x (long long)-2147483648 #truncated once input exceed max int
$2 = 0x80000000
(gdb) p/x (long long)-2147483649
$3 = 0x7fffffff
(gdb) whatis $1
type = long…
林果皞
- 7,539
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- 70
0
votes
1 answer
C++ Chrono - How to use the duration_cast on std::atomic?
I'm have a class Bar with:
class Bar
{
public:
//...
private:
std::atomic m_keepAlive;
}
This class have some methods described below.
This method gets the epoch in ms:
long long Bar::getTimeSinceEpoch()
{
…
waas1919
- 2,365
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0
votes
2 answers
How can i modulo a big integer value
#include
#include
using namespace std;
#include "md5.h"
int main()
{
MD5 md5;
string message = "secretU";
char arr[message.size()];
strcpy(arr, message.c_str());
…
Justpee
- 181
- 1
- 3
- 11
0
votes
1 answer
C variable specified as a long long but recognized as an int
I'm working on a program that checks the validity of credit card numbers for the CS50 class I'm taking (it's legal I swear haha) and I'm currently working on correctly getting the first two numbers of each CC# to check what company it is from. I've…
Noah Sparks
- 13
- 5
0
votes
3 answers
qsort not working properly with long long
I am sorting a two dimensional array a[n][2], with respect to a[i][0],a[i+1][0] breaking ties with non-decreasing a[i][1],a[i+1][1].
qsort is working fine with integer array but not with long long array.
Integer array code
#include…
Vishal
- 33
- 1
- 5
0
votes
1 answer
Does Visual Studio officially support "%lld" format specifier for __int64?
According to this document
https://msdn.microsoft.com/en-us/library/tcxf1dw6(v=vs.140).aspx programmers should printf long long variables with %lld and __int64 variables with %I64d.
And according to this document…
Alek86
- 1,489
- 3
- 17
- 26
0
votes
1 answer
Segmentation fault in scanning long long int in C
I'm trying to write a simple program to calculate the number of common factors for two numbers.I am stuck with segmentation fault(core dumped) occurring while scanning the second number.I don't understand where is the fault?
#include…
Vishal
- 33
- 1
- 5
0
votes
4 answers
How do I use larger integers in a C program?
I'm using Codeblocks and the GNU compiler on a Windows computer. When the compiler runs, it does so under the following conditions:
mingw32-gcc.exe -Wall -g -std=c11 -o obj\Debug\main.o
My code is as follows:
#include
#include…
Joseph Mills
- 137
- 5
0
votes
2 answers
Invalid operand of types 'long long int' to binary 'operator%'
i am in C++ and I get this error:
bool comprovarCodi(long long num, int DC){
bool codi_correcte;
int i=0, suma_senars=0, suma_parells=0, suma_total=0, desena_superior, DC_calculat, cont=0;
while(num!=0){
num=num/10;
cont++;
i++; …
user3894819
- 37
- 8
0
votes
1 answer
Unsigned long long wrong given value after add
I have two strings to add. Strings is HEX values. I convert strings to long long, add and after I back to string. But this operation no working good.
Code:
unsigned long long FirstNum = std::strtoull(FirstString.c_str(), NULL, 16);
unsigned long…
ventaquil
- 2,780
- 3
- 23
- 48
0
votes
4 answers
Long long is 8 bytes, meaning?
I've read the answers to the question of why sizeof(long long) is 8 on most systems, but I'm still not sure how to interpret the meaning of them.
One of the reasons given is that there is a lot of code 'out there' which assumes that sizeof(long…
Mark Leavenworth
- 61
- 2
- 12
0
votes
4 answers
Why won't auto assign values of type long long?
Using auto, I have created a variable number and used cin.get to get the value. I used this code to do so:
auto number = cin.get();
cout << typeid(number).name() << endl;
It seems that even if I enter a number that is over 2147483647, the value…
Reuben Ward
- 101
- 1
- 9
0
votes
0 answers
Inconsistent behavior between using 64 bit integers and using 32 bit integers
I'm seeing some very strange behavior when using 64 bit integers in a little program I've written. My program does the following...
create 2D long long int array (X by Y)
Initialize all array indice values from 0 to X*Y -1
Set the first row and…
user3721655
- 11
- 1
0
votes
1 answer
Returning boolean value from long long differs
In my app I have a function that returns a bool from a long long value _flightId which is initially assigned 0. At some point before calling the function below it is usually assigned a value.
@property (nonatomic, assign) long long flightId;
-…
freshking
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