problem in scanf in c langauge

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C#

scanf(" \"%[^\"]",s);
    printf("%s",s);

this takes input which is within qoutes
for example if i give input as "hello bye " go
then it will print only hello bye
what i want to know is the meaning and other combination possible for " \"%[^\"]" in scanf
and one more doubt is that %s is used for string why it is not used here and still it takes string input

Posted 12-Aug-11 16:22pm

preet88

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Chuck O'Toole · Answer 1 · 2011-08-12T17:10:00

3 minutes with google found:

http://msdn.microsoft.com/en-us/library/xdb9w69d[^]

Reading Undelimited strings
--------------------------------------------------------------------------------

To read strings not delimited by whitespace characters, a set of characters in brackets ([ ]) can be substituted for the s (string) type character. The set of characters in brackets is referred to as a control string. The corresponding input field is read up to the first character that does not appear in the control string. If the first character in the set is a caret (^), the effect is reversed: The input field is read up to the first character that does appear in the rest of the character set.

Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]. This is a common scanf function extension, but note that the ANSI standard does not require it.

Uilleam · Answer 2 · 2011-08-12T17:16:00

The format code you have here is essentially saying "take everything after the first double quote up to but not including the second double quote". The special

%[]

structure still allows you to specify a string, but instead of accepting any characters it sees, you can restrict the characters using codes within the square brackets. In this case those codes are

^\"

where the leading caret means "not any of the following characters", and the slash escapes the double quote, so the result is "take a string until you find a double quote".

As for what else you can do, check your particular library's docs, but for instance you can do things like "a-z" to accept only lower case letters (the dash specifies all the characters between a and z in the character set). So for example if you wanted to take only a DNA sequence you could use

[AGCT]

, or

[AGCTagct]

if you didn't want to be case sensitive. It is something like a regular expression, but very much simpler.

Hope that helps!

problem in scanf in c langauge

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