"'a''b''c'" is it a string literal?

Answer 1

Yes, indeed it is. The string literal will be:
'a''b''c'

Unfortunately the 2 single quotes next to each other in the SoloLearn font looks like a double quote - which can be confusing (I had to copy & paste it into a different editor to check). But, since there are only double quotes on the "outside", they are all interpreted as single quotes.

So I'm wondering: Are you asking based on the way a character literal is assigned:
char c = 'a';
...and that made you wonder what happens to a character literal inside a string literal? In fact, there are no such thing - the single quote (') inside a string literal ("..say 'hi' to him..") is simply interpreted as single quotes i.e. a character like any other.

That leaves the question: what if you want a double quote inside a string to be shown, and not just function to delimit a string literal as in C/C++ syntax? Maybe where you want to output something like this:
She sang "Obladi Oblada" by the Beatles.

In this case you have to "escape" the double quotes like this:
cout << "She sang \"Obladi Oblada\" by the Beatles." << endl;

There are a number of characters that are escaped this way to give them special meaning. For example "This string has a <carriage return> and <line feed> at the end\r\n". there are others as well.

One last trick which is very useful: The compiler will concatenate string literals into a single string literal if they follow each other like this:
string s = "This will be" " a single string literal";

This is very useful to duplicate multi-line text:

string poem =
"To be or not to be..\n"
"That is the question!\n"
"Hamlet said...\n"

Answer 2

Hi @CodeRunner,

Your answer is technically right in the sense that escaping the single quotes inside the string like you have done will work.

However, it is not necessary; all c++ compilers that I am familiar with can handle single quotes inside double-quote delimited string literals. So his "'a''b''c" statement is in fact not invalid and will work fine - including on the SoloLearn C++ compiler.

Answer 3

well...
you need to work a little more see...

there are certain keys that you can't directly put in the cout statements (e.i ', ", return carriage, etc).

So these elements are added in a cout statements using ESCAPE SEQUENCES.

ESCAPE SEQUENCES ARE.
\n - new line
\\ - backslash
\' - single quote
\" - double quote
.
.
. etc.

therefore your statement "'a''b''c" is invalid and will cause compiler error..
it must be " \'a\'\'b\'\'c\' " now this is a string!