Conversion Characters and Their Meanings
| Conversion character | Meaning |
|---|---|
| d | Reads the input as a signed decimal integer. |
| i | Reads the input as a signed integer. If the input begins with 0, then the input is assumed to be octal. If the input starts with 0x or 0X, then hexadecimal input is assumed; otherwise decimal input is assumed. |
| o | Reads the input assuming it is a signed octal integer. |
| u | Reads the input as an unsigned integer. |
| x | Reads the input as a signed hexadecimal integer. |
| c | Reads the number of characters specified by the field width as type char, including whitespace. If the field width specification is absent, one character will be read. If you want to ignore preceding whitespace when reading characters, precede the format specification by a whitespace character. |
| s | Reads a string of successive non white space characters as type char, starting with the next non white space character. |
| [] | Reads characters from the specified set between the square brackets. The first character not found in the set ends the input. For example, the specification %[ab] will only read successive characters that are a or b. To include a ']' character in the set, it must be the first character following the initial left square bracket. Thus %[]ab] reads characters as long as they are a, b, or ]. If the first character after [ is ^, then characters are read if they were not in the set that follows. The specification %[^]ab] reads characters as long as they are not a, b, or ]. |
| a, A, e, E, f, F, G, or g | Converts the input to type float. A sign, a decimal point, and an exponent in the input are optional. |
| % | Reads a % character that is not stored. Thus the specification to skip a % character is %%. |
| p | Reads input as a pointer. The argument should be of type void**. The input form is implementation defined, so consult your compiler and library documentation. |
| n | No input is read, but the number of characters that have been read from the keyboard up to this point are stored in the memory pointed to by the corresponding argument, which should be of type int*. Reading with this specification does not increment the value of the assignment count that is returned. |
The following three specification:
C s []
Two arguments are required.
If the l length modifier is present, the characters are converted to wchar_t.
Any non white space character other than % will cause scanf_s() to read but not store successive occurrences of the character.
To ignore commas separating values in the input, precede each format specifier by a comma.
The % indicates the start of the format specifier. It must always be present.