The role of scanfs in c language

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

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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:

<code class="c">int scanfs(const char *format, ...);</code>

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:

<code class="c">int num;
scanfs("%d", &num);</code>

Read a floating point number and store it in the variable pi:

<code class="c">float pi;
scanfs("%f", &pi);</code>

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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