printf("enter the string");
scanf("%[^\t\n]s",str);
//how the abv code works to accept multi word string without using gets and only using scanf
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[Matches a nonempty sequence of characters from the specified set of accepted characters; the next pointer must be a pointer to char, and there must be enough room for all the characters in the string, plus a terminating null byte. The usual skip of leading white space is suppressed. The string is to be made up of characters in (or not in) a particular set; the set is defined by the characters between the open bracket[character and a close bracket]character. The set excludes those characters if the first character after the open bracket is a circumflex (^)....
The string ends with the appearance of a character not in the (or, with a circumflex, in) set or when the field width runs out.
(Linux scanf(3) manpage.)
So scanf reads up to the first character that is not a tab (\t) or newline (\n). It does read spaces.
