In an interview I was asked
Print a quotation mark using the
printf()
function
I was overwhelmed. Even in their office there was a computer and they told me to try it. I tried like this:
void main()
{
printf("Printing quotation mark " ");
}
but as I suspected it doesn't compile. When the compiler gets the first "
it thinks it is the end of string, which is not. So how can I achieve this?
you should use escape character like this:
printf("\"");
This one also works:
printf("%c\n", printf("Here, I print some double quotes: "));
But if you plan to use it in an interview, make sure you can explain what it does.
EDIT: Following Eric Postpischil's comment, here's a version that doesn't rely on ASCII:
printf("%c\n", printf("%*s", '"', "Printing quotes: "));
The output isn't as nice, and it still isn't 100% portable (will break on some hypothetical encoding schemes), but it should work on EBCDIC.
Besides escaping the character, you can also use the format %c
, and use the character literal for a quotation mark.
printf("And I quote, %cThis is a quote.%c\n", '"', '"');
In C programming language, \
is used to print some of the special characters which has sepcial meaning in C. Those special characters are listed below
\\ - Backslash
\' - Single Quotation Mark
\" - Double Quatation Mark
\n - New line
\r - Carriage Return
\t - Horizontal Tab
\b - Backspace
\f - Formfeed
\a - Bell(beep) sound
You have to use escaping of characters. It's a solution of this chicken-and-egg problem: how do I write a ", if I need it to terminate a string literal? So, the C creators decided to use a special character that changes treatment of the next char:
printf("this is a \"quoted string\"");
Also you can use '\' to input special symbols like "\n", "\t", "\a", to input '\' itself: "\\" and so on.
You have to escape the quotationmark:
printf("\"");
#include<stdio.h>
int main(){
char ch='"';
printf("%c",ch);
return 0;
}
Output: "
Without a backslash, special characters have a natural special meaning. With a backslash they print as they appear.
\ - escape the next character
" - start or end of string
’ - start or end a character constant
% - start a format specification
\\ - print a backslash
\" - print a double quote
\’ - print a single quote
%% - print a percent sign
The statement
printf(" \" ");
will print you the quotes. You can also print these special characters \a, \b, \f, \n, \r, \t and \v with a (slash) preceeding it.
Source: Stackoverflow.com