What is the difference between 'a' and “a”?

Question

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 s

Answer 1

• "a" -> it denotes it is a string. in c++ string is a collection of characters array.
• so string is terminated by delimiter '\0' it indicates the end of string.
• so its size would be 2 because 1-byte for "a" and 1-byte for '\0'

where in case of 'a'-> it is single character. so its size would be 1-byte.

char str[]="a"; 

or

char *ptr = "c";

for  'c' -> char c = 'a';

or we can write as well

char c = 97;