long-integer

问题 Using a window multiplication algorithm to multiply two polynomials[coefficients in Z/nZ and the whole polynomial mod x^r-1 for some r] using long-integer multiplications, what size should I give to the window? Where by "window" I mean the bit-length that the coefficients should use in the initial long-integers such that the result of the long-integer multiplication contains the correct coefficients of the result[the sums of the coefficients "don't overlap"]. At the beginning I thought that

问题 In C, I have a struct with a member "frequency", which is a long unsigned int. The hardware this code is running on is 32 bits. The struct has its value set at instantiation. struct config_list configuration = { ... .frequency = (long unsigned int)5250000000u, ... } In my code, I pass this struct, via pointer, to a subroutine. Inside this subroutine, I don't seem to be able to get the right value, so to check, I put in this: printf("Config frequency: %lu\n", ptr->frequency); printf(

问题 Have a look at the following piece of code: #include <stdio.h> int main(void) { int a; a = 2147483647; printf("a + 1 = %d \t sizeof (a + 1) = %lu\n", a + 1, sizeof (a + 1)); printf("a + 1L = %ld \t sizeof (a + 1L) = %lu\n", a + 1L, sizeof (a + 1L)); a = -1; printf("a + 1 = %d \t sizeof (a + 1) = %lu\n", a + 1, sizeof (a + 1)); printf("a + 1L = %ld \t sizeof (a + 1) = %lu\n", a + 1L, sizeof (a + 1L)); //why a + 1L does not yield long integer ? return 0; } This results in the following output:

问题 I am writing code to lookup the highest dollar amount in a column and bring back the value as well as the value of cells in adjacent columns with 9 char in the target cell When I set the range variable it shows the value of "12000.88" which works fine, however as soon as that value extends to over 9 digits "123000.55" the "set fnd" doesn't find it and the range variable is Nothing. I have tested many other things and have found the only difference is the length of the value Sub Populate() Dim

问题 I am writing code to lookup the highest dollar amount in a column and bring back the value as well as the value of cells in adjacent columns with 9 char in the target cell When I set the range variable it shows the value of "12000.88" which works fine, however as soon as that value extends to over 9 digits "123000.55" the "set fnd" doesn't find it and the range variable is Nothing. I have tested many other things and have found the only difference is the length of the value Sub Populate() Dim

问题 I am writing a program that maintains a linked_list in a file. So I traverse across the file, by using tellp()/tellg() and adding it to a particular long integer(can be seen as an offset) to get to the new location. An simple example would be long next_offset = sizeof(long) + sizeof(int) .... //like size of all the elements in the record, etc curr_node = out.seekg(); while(curr_node != -1) { out.read(...); **curr_node.seekg(curr_node.tellp() + next_offset);** out.read((char *)&curr_node

问题 I trying to compile this code: Int64 itag = BitConverter.ToInt64(temp, 0); itag &= 0xFFFFFFFFFFFFFC00; However this gives me the following error: Operator '&=' cannot be applied to operands of type 'long' and 'ulong' How do I do this? 回答1: See http://msdn.microsoft.com/en-en/library/aa664674%28v=vs.71%29.aspx . If the literal has no suffix, it has the first of these types in which its value can be represented: int , uint , long , ulong . You have 0xFFFFFFFFFFFFFC00 but Int64.Max is:

问题 I have been trying this int and long conversion where I have tried assigning an int variable to a long variable. The code is as follows: public static void main(String []args){ int i = 1024; long j = i; long k = i*i*i*i; System.out.println("j= " +j+ ", k= " +k); } So, while printing j , it simply gave an output of 1024 . But while printing k , it showed an overflow ( k =0). I sorted out this problem by using this technique, where I have explicitly casted each i to long . i.e. public static

问题 Trying to use the GregorianCalendar, I got stuck on a singularity while computing the number of days since a particular date. In the scala interpreter, I entered : scala>import java.util.GregorianCalendar scala>import java.util.Calendar scala>val dateToday = new GregorianCalendar(2012,Calendar.MAY,22).getTimeInMillis() dateToday: Long = 1337637600000 scala>val days1 = (dateToday - (new GregorianCalendar(1976,Calendar.MARCH,28).getTimeInMillis())) / (1000*3600*24) days1: Long = 13203 scala>val

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . I am experiencing something weird. I have a big ArrayList of Long numbers. It contains about 200k numbers in ascending order. These numbers are always distinct; they are not necessarily consecutive, but some groups of them usually are. I want to extract a sorted sample of 5k from this list, so basically this is my