Converting a const char * to std::string [duplicate]
std::stringhas a constructor fromconst char *.This means that it is legal to write: const char* str=”hello”; std::string s = str;
char
Portable code – bits per char
use limits.h CHAR_BIT http://www.cplusplus.com/reference/clibrary/climits/ also, when you want to use exactly a given size, use stdint.h
Conversion from string literal to char* is deprecated [duplicate]
C++ string literals are arrays of const char, which means you can’t legally modify them. If you want to safely assign a string literal to a pointer (which involves an implicit array-to-pointer conversion), you need to declare the target pointer as const char*, not just as char*. Here’s a version of your code that compiles … Read more
C# How to translate virtual keycode to char?
Isn’t that what the System.Windows.Form.KeysConverter class is for? KeysConverter kc = new KeysConverter(); string keyChar = kc.ConvertToString(keyData);
Putting char into a java string for each N characters
Try: String s = // long string s.replaceAll(“(.{10})”, “$1<br>”); EDIT: The above works… most of the time. I’ve been playing around with it and came across a problem: since it constructs a default Pattern internally it halts on newlines. to get around this you have to write it differently. public static String insert(String text, String … Read more
MySQL – TEXT vs CHAR and VARCHAR
TEXT is a variable length datatype, with a maximum of 65,000 characters. LONGTEXT can be used for over 4 trillion characters. To answer your question: it’s a variable lenght, and it will only occupy the amount of characters you store.
Better Way To Get Char Enum
Just cast the value: char status = (char)Enums.DivisionStatus.Active; Note that this will use the value instead of the identifier. The Enums.DivisionStatus.Active value is the character code of ‘A’, as that is the value that you have defined. Using the value directly is faster than looking up the identifier for the value.
Error “cannot convert ‘std::basic_string’ to ‘const char*’ for argument ‘1’ to ‘int system(const char*)'”
The type of expression ” quickscan.exe resolution 300 selectscanner jpg showui showprogress filename ‘”+name+”.jpg'” is std::string. However function system has declaration int system(const char *s); that is it accepts an argumnet of type const char * There is no conversion operator that would convert implicitly an object of type std::string to object of type const … Read more
Why is char distinct from signed char and unsigned char?
There are three distinct basic character types: char, signed char and unsigned char. Although there are three character types, there are only two representations: signed and unsigned. The (plain)char uses one of these representations. Which of the other two character representations is equivalent to char depends on the compiler. In an unsigned type, all the … Read more
Which is faster: char(1) or tinyint(1) ? Why?
Rate insert tinyint(1) insert char(1) insert enum(‘y’, ‘n’) insert tinyint(1) 207/s — -1% -20% insert char(1) 210/s 1% — -19% insert enum(‘y’, ‘n’) 259/s 25% 23% — Rate insert char(1) insert tinyint(1) insert enum(‘y’, ‘n’) insert char(1) 221/s — -1% -13% insert tinyint(1) 222/s 1% — -13% insert enum(‘y’, ‘n’) 254/s 15% 14% — Rate … Read more