CC78K4 datasheet(187/523 Pages) NEC

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CHAPTER 10 LIBRARY FUNCTIONS

User’s Manual U15556EJ1V0UM

187

4-4

scanf

I/O Functions

FUNCTION

scanf reads data from SFR according to the format.

HEADER

stdio.h

FUNCTION PROTOTYPE

int scanf (const char *format, ...);

Function

Arguments

Return Value

scanf

format ... Pointer to the

character string to indicate

input conversion specification

format

... ... Pointer (0 or more)

argument to the object to

assign the converted value

When the character string s is

not null ... number of input

items assigned

EXPLANATION

•

Performs input using the getchar function.

Specifies the input string permitted by the character string

indicated by format. Uses the arguments after format as pointers to an object. format specifies how the

conversion is performed by the input string.

•

When there are not enough arguments for format, normal operation is not guaranteed. When the number of

arguments is excessive, the expression will be evaluated but not input.

•

format consists of 0 or more directives. The directives are as follows.

(1) One or more null character (character that makes isspace true)

(2) Normal character (other than %)

(3) Conversion indication

•

If a conversion ends with an input character that conflicts with the directive, the conflicting input character is

rounded down. The conversion indication is the same as that of the sscanf function.

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