integer

问题 I have an array with keys and values. Each value is an integer. I have an other array with the same keys. How can I subtract all of the values for the matching keys? Also there might be keys that do not occur in the second array but both arrays have the same length. If there is a key in array 2 that is not present in array 1 its value should be unchanged. If there is a key in the first array that is not in the second it should be thrown away. How do I do it? Is there any built-in function for

问题 In C++, you can use an int which is usually 4 bytes. A long long integer is usually 8 bytes. If the cpu was 32 bit, wouldn't that limit it to 32 bit numbers? How come I can use a long long integer if it doesn't support 64 bits? Can the alu add larger integers or something? 回答1: Most processors include a carry flag and an overflow flag to support operations on multi-word integers. The carry flag is used for unsigned math, and the overflow flag for signed math. For example, on an x86 you could

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Random Float in php Is it possible to create a random float number between 0 and 1.0 e.g 0.4, 0.8 etc. I used rand but it only accepts integers. 回答1: mt_rand() / mt_getrandmax(); Avoid the rand() function, since it usually depends on the platform's C rand() implementation, generally creating numbers with a very simple pattern. See this comment on php.net 回答2: What about simply dividing by 10? $randomFloat = rand

问题 I need MySQL to store numbers in a integer field and maintain leading zeros. I cannot use the zerofill option as my current field is Bigint(16) and numbers can vary in amount of leading zeros. IE: 0001 - 0005, then 008 - 010 may need to be stored. I am not concerned about uniqueness of numbers (these aren't being used as IDs or anything) but I still need them to be stored preferably as INTS. The issue using CHAR/VARCHAR and then typecasting the values as integers in PHP means that sorting

问题 I have some numbers of different length (like 1, 999, 76492, so on) and I want to convert them all to strings with a common length (for example, if the length is 6, then those strings will be: '000001', '000999', '076492'). In other words, I need to add correct amount of leading zeros to the number. int n = 999; string str = some_function(n,6); //str = '000999' Is there a function like this in C++? 回答1: or using the stringstreams: #include <sstream> #include <iomanip> std::stringstream ss; ss

问题 I am working on a web application in which data will be transfer between client & server side. I already know that JavaScript int != Java int. Because, Java int cannot be null, right. Now this is the problem I am facing. I changed my Java int variables into Integer. public void aouEmployee(Employee employee) throws SQLException, ClassNotFoundException { Integer tempID = employee.getId(); String tname = employee.getName(); Integer tage = employee.getAge(); String tdept = employee.getDept();

问题 I'm pretty sure this hasn't actually been answered yet on this site. For once and for all, what is the smallest regex that matches a numeric string that is in the range of a 32-bit signed integer, in the range -2147483648 to 2147483647 . I must use regex for validation - that is the only option available to me. I have tried \d{1,10} but I can't figure out how to restrict it to the valid number range. To aid developing in regex, it should match: -2147483648 -2099999999 -999999999 -1 0 1

问题 I'm pretty sure this hasn't actually been answered yet on this site. For once and for all, what is the smallest regex that matches a numeric string that is in the range of a 32-bit signed integer, in the range -2147483648 to 2147483647 . I must use regex for validation - that is the only option available to me. I have tried \d{1,10} but I can't figure out how to restrict it to the valid number range. To aid developing in regex, it should match: -2147483648 -2099999999 -999999999 -1 0 1

问题 I'm looking for an efficient method of generating large numbers (that includes floating point types!) in Swift, with arbitrary ranges (which may even be UInt.max or Int.max ) All the existing questions I've seen either crash for large values ( UInt.max ) or don't support ranges. I know that you can read from /dev/urandom for random bytes, but that doesn't help restrict these values to a given interval (and I'm pretty sure looping until it does isn't efficient). 回答1: Here is a possible

问题 I've been searching for a while now, but what I can find is not what I search for. I need to convert an integer value, that may be very huge , to a string. Sounds easy: "$var" ? No, because this can lead to the E+ representation of the number. <?php $var = 10000000000000000000000000; echo $var."\n"; echo "'$var'\n"; echo (string) $var."\n"; echo strval($var); ?> 1.0E+25 '1.0E+25' 1.0E+25 1.0E+25 How can I make the output be 10000000000000000000000000 instead? 回答1: This is not stored as an