string - Escape sequence for ? in c++ -

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I was looking at the escape sequences for characters in C ++ strings and I saw that the escape sequence for the question mark is. Can anyone tell me why this is? It just sounds a little strange and I do not know what? Thanks in a string.

This is to keep a question mark from getting it wrong as part of someone.

For example, 

  "what ??!"

" | will be interpreted as a character. Therefore, you have to avoid question marks as the following: 

  "what \? \?! \"

example fulfillment


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