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Why is “int i = 2147483647 + 1;” OK, but “byte b = 127 + 1;” is not compilable?
... if the expression is a constant expression (§15.28) of type byte, short, char or int :
A narrowing primitive conversion may be used if the type of the variable is byte, short, or char, and the value of the constant expression is representable in the type of the variable.
Without this clause, ...
Best way to format integer as string with leading zeros? [duplicate]
...
I've chosen to concat the format string instead, inserting the length of a list for example. Are there any advantages of your way of doing it?
– Zelphir Kaltstahl
Aug 29 '15 at 10:19
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How does this print “hello world”?
...01100100100111110111111110111101100011000010101000
The program decodes a character for every 5-bits group, from right to left
00100|01100|10010|01111|10111|11111|01111|01100|01100|00101|01000
d | l | r | o | w | | o | l | l | e | h
5-bit codification
For 5 bits, it is...
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 ...
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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Remove the first character of a string
I would like to remove the first character of a string.
4 Answers
4
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How to initialize all members of an array to the same value?
...8(...) STRUCTVAL_32(__VA_ARGS__), STRUCTVAL_16(__VA_ARGS__)
struct Pair { char key[16]; char val[32]; };
struct Pair p_data[] = { STRUCTVAL_48("Key", "Value") };
int a_data[][4] = { STRUCTVAL_48(12, 19, 23, 37) };
macro names are negotiable.
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Remove portion of a string after a certain character
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+1 It's the only one that works if the control characters are NOT present (unlike the others that return an empty string if the control characters are not present in the source string)
– Tom Auger
Apr 28 '15 at 2:26
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How can I hash a password in Java?
...te[16];
random.nextBytes(salt);
KeySpec spec = new PBEKeySpec("password".toCharArray(), salt, 65536, 128);
SecretKeyFactory f = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
byte[] hash = f.generateSecret(spec).getEncoded();
Base64.Encoder enc = Base64.getEncoder();
System.out.printf("salt: %s...
What does {0} mean when initializing an object?
... initialized shall be
default-initialized.
Example:
struct S { int a; char* b; int c; };
S ss = { 1, "asdf" };
initializes ss.a with 1, ss.b with
"asdf", and ss.c with the value of an
expression of the form int(), that is,
0.
You can find the complete spec on this topic here
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