What does scanf mean in c++-C++-php.cn

What does scanf mean in c++

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Release： 2024-05-01 11:18:18

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scanf is a function used to read formatted data from standard input. Its syntax is: int scanf(const char *format, ...); format is a format string specifying the data format, ... is a list of variables to be read. Format strings contain special characters that specify the data type and format. scanf returns the number of successfully read items.

What does scanf mean in c++

What is scanf?

scanf is a function in the C and C programming languages for reading formatted data from standard input. It allows programmers to read data from user input or files and store it in variables.

How to use scanf?

scanf function uses the following syntax:

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

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Where:

format: A format string that specifies the expected input format .
...: Represents a list of variables to read data from.

Format string

The format string contains special characters that specify the specific data type and format to be read. Here are some common format specifiers:

%c: Characters
%d: Decimal integer
%f: Floating point number
%s: String

## For example:

<code class="cpp">int num;
char ch;
scanf("%d %c", &num, &ch);</code>

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This line of code will read an integer from standard input and store it in the variable num, and then read a character and store it in the variable ch.

Return value

The scanf function returns the number of successfully read items. If all items were read successfully, an integer equal to the number of items provided in the format string is returned. Otherwise, returns a small, non-negative integer representing the number of items successfully read.

Notes

You need to pay attention to the following when using scanf:

Variables must be declared correctly and space allocated.
The input data must conform to the format specified by the format string. Otherwise, undefined behavior results.

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