The scanfs function is used in C language to read formatted data from standard input and store the read data in the specified variable. It reads data according to the format specifier (such as %d, %f) specified by the format parameter and stores the data in the variable address specified in the ... parameter. The scanfs function returns the number of data items read successfully, or -1 if the read fails.
What is the role of scanfs in C language
?
scanfs is a standard input function in C language, used to read formatted data from standard input.
Function:
- Read data from standard input according to the specified format.
- Store the read data in the specified variable.
How to use:
The syntax of the scanfs function is as follows:
int scanfs(const char *format, ...);
Among them:
-
format
: The format specifier string to read data from the input. -
...
: Address list of variables to store read data.
Format specifier:
The format specifier is a sequence of characters that specifies the type and format of the data to be read. Common format specifiers include:
-
%d
: Read integer -
%f
: Read floating point number -
%c
: Read character -
%s
: Read string
Example:
Read an integer and store it in the variable num
:
int num; scanfs("%d", &num);
Read a floating point number and store it in the variable pi
:
float pi; scanfs("%f", &pi);
Note:
- The scanfs function returns an integer indicating the number of data items successfully read.
- If reading the data fails (for example, the input data does not match the format specifier), -1 is returned.
- The address of the variable must be passed to the scanfs function using the address operator
&
.
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