I am retrieving a lot of information in a list, linked to a database and I want to create a string of groups, for someone who is connected to the website. I use this to test but this is not dynamic, so it is really bad: string strgroupids = “6”; I want to use this … Read more
I want to get, given a character, its ASCII value. For example, for the character a, I want to get 97, and vice versa. 4 Answers 4
I want to convert a std::string into a char* or char[] data type. std::string str = “string”; char* chr = str; Results in: “error: cannot convert ‘std::string’ to ‘char’ …”. What methods are there available to do this? 18 Answers 18
I have a char array: char[] a = {‘h’, ‘e’, ‘l’, ‘l’, ‘o’, ‘ ‘, ‘w’, ‘o’, ‘r’, ‘l’, ‘d’}; My current solution is to do String b = new String(a); But surely there is a better way of doing this? 14 Answers 14
What is the proper way to turn a char[] into a string? The ToString() method from an array of characters doesn’t do the trick. 7 s 7 There’s a constructor for this: char[] chars = {‘a’, ‘ ‘, ‘s’, ‘t’, ‘r’, ‘i’, ‘n’, ‘g’}; string s = new string(chars);
In C/C++, what an unsigned char is used for? How is it different from a regular char? 16 s 16 In C++, there are three distinct character types: char signed char unsigned char If you are using character types for text, use the unqualified char: it is the type of character literals like ‘a’ or … Read more
In C, one can use a string literal in a declaration like this: char s[] = “hello”; or like this: char *s = “hello”; So what is the difference? I want to know what actually happens in terms of storage duration, both at compile and run time. 14 s 14 The difference here is that … Read more
I have a char and I need a String. How do I convert from one to the other? 12 s 12 You can use Character.toString(char). Note that this method simply returns a call to String.valueOf(char), which also works. As others have noted, string concatenation works as a shortcut as well: String s = “” + … Read more
How can I convert an std::string to a char* or a const char*? 10 s 10 If you just want to pass a std::string to a function that needs const char* you can use std::string str; const char * c = str.c_str(); If you want to get a writable copy, like char *, you can … Read more
In Swing, the password field has a getPassword() (returns char[]) method instead of the usual getText() (returns String) method. Similarly, I have come across a suggestion not to use String to handle passwords. Why does String pose a threat to security when it comes to passwords? It feels inconvenient to use char[]. 1 18 Strings … Read more
