differnce between escape sequence and special characters

1) difference between escape sequences and special characters?
2) (") and (\")do these two have different meaning for the compiler?
3) uses of escape character?
1) Depends what you mean by "special characters". Escape sequences just let you express any value as a literal string.

2) Yes, very different things.

The quote (") character is used by the compiler to differentiate between code and literal string data.


cout << "(5+2)";  // prints (5+2)
cout << (5+2); // prints 7 

Since the quote marks both the beginning and end of the string literal data, this means it would be impossible to represent the quote character inside the string normally. Example:

cout << "Bob said "hi" to Jeff";

As the syntax highlighting here shows, the compiler will see this as 2 different strings ("Bob said " and " to Jeff ). The 'hi' in the middle is treated as code and not part of the string... which will likely cause a compiler error.

To solve this problem, quotes can be expressed as an escape sequence:

cout << "Bob said \"hi\" to Jeff";

Since the inner quotes are escaped, this means they are interpreted as part of the string, rather than the begin/end markers for string data.

3) My answer to #2 illustrates one use of the escape character. Another is to express other characters which cannot be easily represented/typed.

For example \t is a tab
\n is a new line
\r is a carriage return
\\ is the \ character
\x64 is the character code represented by hex value 0x64 (lowercase 'd')
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