I am learning C++ and have got a question that I cannot find the answer to.
What is the difference between a char constant (using single quotes) and a string constant (with double quotes)?
All my search results related to char arrays vs std::string. I am after the difference between 'a' and "a".
Would there be a difference in doing the following:
cout << "a";
cout << 'a';
'a' is a character literal. It's of type char, with the value 97 on most systems (the ASCII/Latin-1/Unicode encoding for the letter a).
"a" is a string literal. It's of type const char[2], and refers to an array of 2 chars with values 'a' and ''. In most, but not all, contexts, a reference to "a" will be implicitly converted to a pointer to the first character of the string.
Both
cout << 'a';
and
cout << "a";
happen to produce the same output, but for different reasons. The first prints a single character value. The second successively prints all the characters of the string (except for the terminating '') -- which happens to be the single character 'a'.
String literals can be arbitrarily long, such as "abcdefg". Character literals almost always contain just a single character. (You can have multicharacter literals, such as 'ab', but their values are implementation-defined and they're very rarely useful.)
(In C, which you didn't ask about, 'a' is of type int, and "a" is of type char[2] (no const)).
