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In Java, how do I convert a byte array to a string of hex digits while keeping leading zeros? [dupli

...ffffff" because of sign extension. So one might need to take the last two characters of the returned string. – Marvo Jul 27 '12 at 20:55 ...
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Difference between const & const volatile

...be the status register for a serial port. Various bits will indicate if a character is waiting to be read or if the transmit register is ready to accept a new character (ie., - it's empty). Each read of this status register could result in a different value depending on what else has occurred in t...
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How to remove single character from a String

For accessing individual characters of a String in Java, we have String.charAt(2) . Is there any inbuilt function to remove an individual character of a String in java? ...
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Number of lines in a file in Java

... byte[] c = new byte[1024]; int count = 0; int readChars = 0; boolean empty = true; while ((readChars = is.read(c)) != -1) { empty = false; for (int i = 0; i < readChars; ++i) { if (c[i] == '\n') { ...
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How can I use mySQL replace() to replace strings in multiple records?

...GREATERTHAN', '>'), 'LESSTHAN', '<') You can also do this when you select the data (as opposed to when you save it). So instead of : SELECT MyURLString From MyTable You could do SELECT REPLACE (MyURLString, 'GREATERTHAN', '>') as MyURLString From MyTable ...
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How to get my IP address programmatically on iOS/macOS?

... @"ipv6" - (NSString *)getIPAddress:(BOOL)preferIPv4 { NSArray *searchArray = preferIPv4 ? @[ /*IOS_VPN @"/" IP_ADDR_IPv4, IOS_VPN @"/" IP_ADDR_IPv6,*/ IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR...
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How much is too much with C++11 auto keyword?

...to spaces = space & space & space; with r_and_t<r_and_t<r_char_t<char>&, r_char_t<char>&>, r_char_t<char>&> spaces = space & space & space; On the other hand, when type is known and is simple, it's much better if it stated explicitly...
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How can I create directory tree in C++/Linux?

...#include "sysstat.h" typedef struct stat Stat; static int do_mkdir(const char *path, mode_t mode) { Stat st; int status = 0; if (stat(path, &st) != 0) { /* Directory does not exist. EEXIST for race condition */ if (mkdir(path, mode) != 0 ...
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Calling C++ class methods via a function pointer

...ion pointer and initialize to NULL int (TMyClass::*pt2ConstMember)(float, char, char) const = NULL; // C++ class TMyClass { public: int DoIt(float a, char b, char c){ cout << "TMyClass::DoIt"<< endl; return a+b+c;}; int DoMore(float a, char b, char c) const { cout <&...
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Best practices for circular shift (rotate) operations in C++

...lude <stdint.h> // for uint32_t #include <limits.h> // for CHAR_BIT // #define NDEBUG #include <assert.h> static inline uint32_t rotl32 (uint32_t n, unsigned int c) { const unsigned int mask = (CHAR_BIT*sizeof(n) - 1); // assumes width is a power of 2. // assert ( (c<...