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Undefined reference to static constexpr char[]
I want to have a static const char array in my class. GCC complained and told me I should use constexpr , although now it's telling me it's an undefined reference. If I make the array a non-member then it compiles. What is going on?
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Java String - See if a string contains only numbers and not letters
...> 2) {
Instead of checking that the string doesn't contain alphabetic characters, check to be sure it contains only numerics.
If you actually want to use the numeric value, use Integer.parseInt() or Double.parseDouble() as others have explained below.
As a side note, it's generally consider...
PreparedStatement IN clause alternatives?
... and cons of each is available here.
The suggested options are:
Prepare SELECT my_column FROM my_table WHERE search_column = ?, execute it for each value and UNION the results client-side. Requires only one prepared statement. Slow and painful.
Prepare SELECT my_column FROM my_table WHERE search_...
Repair all tables in one go
...ing query to print REPAIR SQL statments for all tables inside a database:
select concat('REPAIR TABLE ', table_name, ';') from information_schema.tables
where table_schema='mydatabase';
After that copy all the queries and execute it on mydatabase.
Note: replace mydatabase with desired DB name
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How to define an enum with string value?
...value with each enum value, or in this case if every separator is a single character you could just use the char value:
enum Separator
{
Comma = ',',
Tab = '\t',
Space = ' '
}
(EDIT: Just to clarify, you can't make char the underlying type of the enum, but you can use char constants t...
How to print (using cout) a number in binary form?
...senting the value, then stream that to cout.
#include <bitset>
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char a = -58;
std::bitset<8> x(a);
std::cout << x << '\n';
short c = -315;
std::bitset<16> y(c);
std::cout << y << '\n';
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LPCSTR, LPCTSTR and LPTSTR
...o a const string (LP means Long Pointer)
LPCTSTR is a pointer to a const TCHAR string, (TCHAR being either a wide char or char depending on whether UNICODE is defined in your project)
LPTSTR is a pointer to a (non-const) TCHAR string
In practice when talking about these in the past, we've left ou...
Regarding 'main(int argc, char *argv[])' [duplicate]
Every program is starting with the main(int argc, char *argv[]) definition.
8 Answers
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Replacing instances of a character in a string
...ce(';', ':') + line[10:]
That'll replace all semi-colons in the first 10 characters of the string.
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Why use pointers? [closed]
...and much confusion. ;-) If we talk about simple data types such as int and char there is little difference between an array and a pointer.
These declarations are very similar (but not the same - e.g., sizeof will return different values):
char* a = "Hello";
char a[] = "Hello";
You can reach any e...