A single whitespace in the format string validates any quantity of whitespace characters extracted from the stream (including none). Whitespace character: the function will read and ignore any whitespace characters encountered before the next non-whitespace character (whitespace characters include spaces, newline and tab characters - see isspace).
Parameters format C string that contains a sequence of characters that control how characters extracted from the stream are treated: The additional arguments should point to already allocated objects of the type specified by their corresponding format specifier within the format string. Hence, the list of arguments must be given in the order they are specified in the format string.Reads data from stdin and stores them according to the parameter format into the locations pointed by the additional arguments. Scanf_s reads from the input string sequentially. If there is a failure during the assignment of arguments or while interpreting an input or if any run-time constraints are violated, EOF (End Of File) is returned.įollowing is an example of how the scanf_s function is used to take input from stdin and store the data in it to several other variables. Upon successful execution, it returns the number of items filled in the list of additional arguments given in the parameters. Scanf_s can return one of the two things: if there’s a %s specifier in the format string, there should be a character pointer in the additional arguments. These arguments are pointers to storage spaces (variables) and must have the same type as their corresponding specifier. : These are the optional arguments that correspond to the specifiers used in the format string.
The scanf_s function takes in 1 mandatory argument and then a list of additional arguments:įormat: The pointer to the format string which may include format specifiers like %s.
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