This section describes the scanf input conversions for reading
string and character values: %s and %c.
The %c conversion is the simplest: it matches a fixed number of characters, always. The maximum field with says how many characters to read; if you don't specify the maximum, the default is 1. This conversion does not skip over initial whitespace characters. It reads precisely the next n characters, and fails if it cannot get that many.
The %s conversion matches a string of non-whitespace characters. It skips and discards initial whitespace, but stops when it encounters more whitespace after having read something.
For example, reading the input:
hello, world
with the conversion %10c produces " hello, wo", but
reading the same input with the conversion %10s produces
"hello,".