long-integer

问题 I have read from memory a 6 byte unsigned char array. The endianess is Big Endian here. Now I want to assign the value that is stored in the array to an integer variable. I assume this has to be long long since it must contain up to 6 bytes. At the moment I am assigning it this way: unsigned char aFoo[6]; long long nBar; // read values to aFoo[]... // aFoo[0]: 0x00 // aFoo[1]: 0x00 // aFoo[2]: 0x00 // aFoo[3]: 0x00 // aFoo[4]: 0x26 // aFoo[5]: 0x8e nBar = (aFoo[0] << 64) + (aFoo[1] << 32) +

问题 I have this code which handles Strings like "19485" or "10011010" or "AF294EC"... long long toDecimalFromString(string value, Format format){ long long dec = 0; for (int i = value.size() - 1; i >= 0; i--) { char ch = value.at(i); int val = int(ch); if (ch >= '0' && ch <= '9') { val = val - 48; } else { val = val - 55; } dec = dec + val * (long long)(pow((int) format, (value.size() - 1) - i)); } return dec; } this code works for all values which are not in 2's complement. If I pass a hex

问题 While solving exercises from the K&R C book, I stumbled upon the exercise 2.1. At first I got as UINT_MAX as -1 , but then I used the %u placeholder, but now its giving me the same number as ULONG_MAX . In the book in Appendix B, they say that UINT_MAX should be 65535 and ULONG_MAX should be 4294967295 , but when running the exercise, its giving me for both UINT_MAX and ULONG_MAX as 4294967295 . Why is that? 回答1: First of all, the right way to print an unsigned long is not %u but %lu . Second

问题 I got errors when compiling this: TreeMap <String, Long> myMap = new TreeMap <String, Long>(); //populate the map myMap.put("preload_buffer_size", 1024); myMap.put("net_buffer_length", 1024); //etc... error: no suitable method found for put(String,int) myMap.put("preload_buffer_size", 1024); ^ method TreeMap.put(String,Long) is not applicable (actual argument int cannot be converted to Long by method invocation conversion) method AbstractMap.put(String,Long) is not applicable (actual argument

问题 I'm dealing with an char[] containing text which should represent a double number value OR a long number. I'm in a need to write a function that detects which of the above data-types is represented (if any). I thought about using strtol() and check if it fails to parse the entire string, and if it fails, using strtod(). I would be happy to see whether there is a better option to do so. Thanks. 回答1: I thought about using strtol() and check if it fails to parse the entire string, and if it

问题 I would like to pass a signed int to gsl_rng_uniform_int (const gsl_rng * r, unsigned long int n) . The signed int that I'm passing is greater than or equal to zero. The function will return a number between 0 and n , so if I pass it a positive signed int, it will return something that is in the range of a signed int. I then want to store the return value in a signed int. What's the cleanest way to do this with the obvious expected behaviour? I'm on a 64-bit compiler on a 64-bit Linux machine

问题 I would like to know, how take the value "Tile32px" from this Json: (http://360api.chary.us/?gamertag=superdeder) with PHP. I tried this way: <?php $json = file_get_contents('http://360api.chary.us/?gamertag=superdeder'); $gamer = json_decode($json); echo $gamer->Gamertag; echo "<br><br>"; $data = json_decode($json, true); $users=$data['LastPlayed']; foreach ($users as $user) { echo $user['Title']; echo "<br>"; } echo "<br>"; $users2=$data['Pictures']; foreach ($users2 as $user2) { echo

问题 I have a String variable in this format "HH:mm" . Lets say the variable value is 05:30. How would I be able to get those numbers from string and calculate : (05 * 60 * 60 * 1000) + (30 * 60 * 1000) and put that number (miliseconds) in a new long variable. Basically I need to convert the String time variable into miliseconds long variable. 回答1: Let s contain the string of interest. Then e.g. you can say String s = "5:30"; Pattern p = Pattern.compile("(\\d+):(\\d+)"); Matcher m = p.matcher(s);

问题 i am populating the timespec structure. The intention is, user will always enter values in seconds (can also be 0.01 secs), so we are converting the seconds to nanoseconds using: lt_leak_start = atoll(getenv("LT_LEAK_START")) * sec_to_nsec; where variable static long sec_to_nsec = 1000000000; and then using it as an argument to settime: timer_settime(timerid,0,&its,NULL) . But on doing it an error occurs: settimer failed: Invalid argument Please help me. Thanks in advance. enter code here

问题 I'm writing an Android application that contains lots of long lists and I need to accelerate scrolling somehow. The Android Contacts application for example uses a list of letters to allow quick scrolling to a certain spot in the list ... it's not exactly what I'm looking for though. I've seen other applications use a handle (or paddle) that appears when you start scrolling and allows you to easily drag the scrollbars to a specific location, that might be a better solution for me. I'm