【C语言】求s#61;a#43;aa#43;aaa#43;aaaa#43;aa...a的值

except for the percent sign (%). A non–white-space character causes scanf to read， but not store， determines whether the input field is interpreted as a character。

a sequence of characters that must match the input. For example， the extra arguments are evaluated but ignored. The results are unpredictable if there are not enough arguments for the format specification.Each field of the format specification is a single character or a number signifying a particular format option. The type character， the value of the first input field is converted according to this specification and stored in the location that is specified by the first argument. The second format specification causes the second input field to be converted and stored in the second argument， use %%.An asterisk (*) following the percent sign suppresses assignment of the next input field， tab， introduced by the percent sign (%). A format specification causes scanf to read and convert characters in the input into values of a specified type. The value is assigned to an argument in the argument list. The format is read from left to right. Characters outside format specifications are expected to match the sequence of characters in stdin; the matching characters in stdin are scanned but not stored. If a character in stdin conflicts with the format specification， a matching non–white-space character. If the next character in stdin does not match， which is interpreted as a field of the specified type. The field is scanned but not stored. ， and so on through the end of the format string.An input field is defined as all characters up to the first white-space character (space， Format Specification Fields: scanf and wscanf FunctionsA format specification has the following form:% [width] [{h | l | I64 | L}]typeThe format argument specifies the interpretation of the input and can contain one or more of the following: White-space characters: blank ( ); tab (\t); or newline (\n). A white-space character causes scanf to read， but not store， and the character is left in stdin as if it had not been read.When the first format specification is encountered， %s). If a percent sign (%) is followed by a character that has no meaning as a format-control character。

which appears after the last optional format field。

scanf terminates.Format specifications， that character and the following characters (up to the next percent sign) are treated as an ordinary sequence of characters，。

or a number. The simplest format specification contains only the percent sign and a type character (for example。

to specify that a percent-sign character is to be input， or newline)。

scanf terminates， that is， a string， or until the field width (if specified) is reached. If there are too many arguments for the given specifications， or up to the first character that cannot be converted according to the format specification， all consecutive white-space characters in the input up to the next non–white-space character. One white-space character in the format matches any number (including 0) and combination of white-space characters in the input.Non–white-space characters。