How to print hello world in double quote in c ?

[chandresh]

How to print hello world in double quote in c ?

[weaknessforcats]

You have to use an escape sequence.
The escape sequence is a backslash (\). The \ tells the compiler that the character behind the backslash is a code for something else.

So \" says that the " is not part of the syntax but is data:

printf("\"Hello world!\""\n);

See also the \n. The compiler does not see this as a \ and an n but a code. In this case \n is the code for a newline on the screen.

There are various escape sequence characters that you should review.