long-integer

Overflow exception is throwing- even the value exceeds the limit

由 核能气质少年 提交于 2019-12-10 10:06:59
问题 Why the following code Gives output as -2 instead for throwing overflow exception ? long x = long.MaxValue; long y = long.MaxValue + x; 回答1: The actual behaviour depends on project settings, unchecked etc. To ensure overflow exception use checked , e.g. checked { long x = long.MaxValue; long y = long.MaxValue + x; } 回答2: Presumably because you're executing it in an unchecked context. Arithmetic on the primitive integer types can execute in a checked or unchecked context. Operations which

What is the largest data type for storing (and printing) an integer?

由 我的未来我决定 提交于 2019-12-10 04:19:19
问题 In C on a 32-bit system, which data type will store (and can therefore print) the largest integer? Is it long long or unsigned long ? Is there an unsigned long long ? And which is the most precise and politically correct? 回答1: Your question is a bit unclear, but intmax_t is the largest signed integer-valued type (and uintmax_t is the largest unsigned integer type). These are typedefs defined in <stdint.h> , but if you are printing them, you need <inttypes.h> instead, and the PRInMAX macros

hibernate returning BigDecimal datatype instead of long

由 旧巷老猫 提交于 2019-12-10 04:17:22
问题 The hibernate named query returns a BigDecimal for a column that has datatype NUMBER. select col1 as "col1" from table1 union select col2 as "col1" from table2 On client side, I expect the datatype of col1 to be long (primitive) I do this: <return-scalar column="col1" type="java.lang.Long" /> or <return-scalar column="col1" type="long" /> In both cases, I get : java.lang.ClassCastException: java.math.BigDecimal incompatible with java.lang.Long How can I fix this? My suspiscion, something

Long Division in Java not working as expected

由 随声附和 提交于 2019-12-10 04:10:17
问题 class LongDiv{ public static void main(String [] args){ final long x = 24*60*60*1000*1000; final long y = 24*60*60*1000; System.out.println(x/y); } } although the expected answer is 1000, but the javac gives it as 5. Reason? 回答1: The long x you are creating isn't the value you expected. It is in the integer range. To create longs, use: final long x = 24L*60L*60L*1000L*1000L; final long y = 24L*60L*60L*1000L; System.out.println(x/y); The x you computed, in the integer range, was 500654080 .

What is the difference between unsigned long and unsigned long long?

由 ぐ巨炮叔叔 提交于 2019-12-09 20:50:33
问题 I expected that the size will be different. But both are showing 8bytes. #include <iostream> using namespace std; int main() { cout<<"Size of long:"<<sizeof(unsigned long)<<"\n"; cout<<"Size of Long Long:"<< sizeof(unsigned long long)<<"\n"; } Output: Size of long:8 Size of Long Long:8 回答1: They're two distinct types, even if they happen to have the same size and representation in some particular implementation. unsigned long is required to be at least 32 bits. unsigned long long is required

narrowing conversion of long long int to long unsigned int inside {} [-Wnarrowing]

由 情到浓时终转凉″ 提交于 2019-12-09 03:03:29
now the newer error "narrowing conversion of long long int to long unsigned int inside {} [-Wnarrowing]" the source code relative to it: // Implements the joint conditional cummulative density functions for CP-nets // For node j in the lexicographic topological sort as defined by the dag code: // the table gives P( s, t | n, c, j ). // The number of rows in each table is the triangular number of min(c, j). #ifndef TABLES_H #define TABLES_H #include <random> // Mersenne Twister #include <chrono> // Used to initialize MT const unsigned long int factorial[17] = {1, 1, 2, 6, 24, 120, 720, 5040,

printf and %llu vs %lu on OS X [duplicate]

由 萝らか妹 提交于 2019-12-09 02:53:43
问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: how to printf uint64_t? Why is it that on my 64-bit Mac (I am using Clang) the uint64_t type is unsigned long long while on 64-bit Ubuntu the uint64_t type is unsigned long ? This makes it very difficult for me to get my printf calls to not give compiler warnings (or indeed even to work) under both environments. I can try to use macros to try to choose the correct string ( #define LU either %llu or %lu , and in

JPA entity id - long or Long

由 最后都变了- 提交于 2019-12-09 00:23:05
问题 Should the ID of your Entity be long (primitive type) or Long (object type)? The ID is the primary key of my table and is never 'null' in the database. My co-workers suggest to use an Object Type Long. Hibernate Reverse Engeneering tool generates a primitive type long for id by default. What to choose? long or Long? @Entity @Table(name = "COUNTRY") public class CountryEntity implements java.io.Serializable { private static final long serialVersionUID = 1L; @Id @Column(name = "ID") private

Weird behaviour of np.sqrt for very large integers

由 ↘锁芯ラ 提交于 2019-12-08 20:29:23
问题 >>> np.__version__ '1.7.0' >>> np.sqrt(10000000000000000000) 3162277660.1683793 >>> np.sqrt(100000000000000000000.) 10000000000.0 >>> np.sqrt(100000000000000000000) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: sqrt Huh... AttributeError: sqrt what's going on here then? math.sqrt doesn't seem to have the same problem. 回答1: The final number is a long (Python's name for an arbitrary precision integer), which NumPy apparently can't deal with: >>> type

What is the difference between longblob and longtext in mysql?

由 末鹿安然 提交于 2019-12-08 19:23:12
问题 What is difference between longblob and longtext in mysql? What should I use to save a long topic ? 回答1: BLOBs are for Binary Large Objects. If you're storing binary data in your DB, then BLOB would be the table type you want. Otherwise.. longtext. In your case longtext. 回答2: BLOB and TEXT are basically identical, except that TEXT fields have character set translation rules applied. BLOB fields do not. So with BLOB what you put in is what you get. With TEXT, what you put may not be what you
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