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Get string character by index - Java
I know how to work out the index of a certain character or number in a string, but is there any predefined method I can use to give me the character at the nth position? So in the string "foo", if I asked for the character with index 0 it would return "f".
...
C pointers : pointing to an array of fixed size
... an array to a function is by using a pointer-to-array parameter
void foo(char (*p)[10]);
(in C++ language this is also done with references
void foo(char (&p)[10]);
).
This will enable language-level type checking, which will make sure that the array of exactly correct size is supplied a...
C: differences between char pointer and array [duplicate]
...
True, but it's a subtle difference. Essentially, the former:
char amessage[] = "now is the time";
Defines an array whose members live in the current scope's stack space, whereas:
char *pmessage = "now is the time";
Defines a pointer that lives in the current scope's stack space, b...
Can I combine :nth-child() or :nth-of-type() with an arbitrary selector?
... lxml, many of these tools allow XPath as an alternative:
//table[contains(concat(' ', @class, ' '), ' myClass ')]//tr[contains(concat(' ', @class, ' '), ' row ')][position() mod 2)=1]
Other solutions using different technologies are left as an exercise to the reader; this is just a brief, contrive...
Best way to check for “empty or null value”
... .. for '' (or for any string consisting of only spaces with the data type char(n))
NULL .. for NULL
FALSE .. for anything else
So to check for: "stringexpression is either NULL or empty":
(stringexpression = '') IS NOT FALSE
Or the reverse approach (may be easier to read):
(stringexpression &l...
Get path of executable
...f (BOOST_OS_CYGWIN || BOOST_OS_WINDOWS)
std::string executable_path(const char* argv0)
{
typedef std::vector<char> char_vector;
typedef std::vector<char>::size_type size_type;
char_vector buf(1024, 0);
size_type size = buf.size();
bool havePath = false;
bool shouldContinue =...
C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
16
17
#include <stdio.h>
struct str{
int len;
char s[0];
};
struct foo {
struct str *a;
};
int main(int argc, char** argv) {
struct foo f={0};
if (f.a->s) {
printf( f.a->s);
}
return 0;
}
你编...
Length of string in bash
...NG=C LC_ALL=C
bytlen=${#myvar}
LANG=$oLang LC_ALL=$oLcAll
printf "%s is %d char len, but %d bytes len.\n" "${myvar}" $chrlen $bytlen
will render:
Généralités is 11 char len, but 14 bytes len.
you could even have a look at stored chars:
myvar='Généralités'
chrlen=${#myvar}
oLang=$LANG oLc...
What is the difference between char * const and const char *?
...
The difference is that const char * is a pointer to a const char, while char * const is a constant pointer to a char.
The first, the value being pointed to can't be changed but the pointer can be. The second, the value being pointed at can change but t...
What is the difference between an int and a long in C++?
...
The only guarantee you have are:
sizeof(char) == 1
sizeof(char) <= sizeof(short) <= sizeof(int) <= sizeof(long) <= sizeof(long long)
// FROM @KTC. The C++ standard also has:
sizeof(signed char) == 1
sizeof(unsigned char) == 1
// NOTE: These size are...