HP C/iX Library Reference Manual (30026-90004)

302 Chapter5

HP C/iX Library Function Descriptions

scanf

character, in the array arr4.

Note that there are some characters left in stdin that were not read. Any characters left

unread in the input remain there, which might cause unexpected errors.

Suppose that, later in the above program fragment, you want to read a string from stdin

using %s. No matter what string you type in as input, it will never be read, because the %s

conversion speciﬁcation is satisﬁed by reading "mnop" (the characters left over from the

previous read operation). To solve this, be sure you have read the entire current line of

input before attempting to read the next. To ﬁx this in the previous scanf() example, add

a %*s%*c conversion speciﬁcation at the end of the format (%*s reads characters up to the

next newline character, and %*c reads the newline). This reads and discards the excess

characters.

You can use a minus character (-) between characters in the match list inside a [

conversion speciﬁer to indicate a range of characters. For example, the conversion speciﬁer

[A-Z] matches all the characters from A through Z