How to use scanf in c language

The scanf function is used to read data from standard input and store the data into corresponding variables according to the specified format string. Specific steps include: specifying a format string, defining the format and variable type for reading data. Provide a variable pointer and pass the variable address to store the read data. Call the scanf function, passing the format string and variable pointer as arguments.

Usage of scanf function in C language

The scanf function is used in C language to read from standard input The function to get data, its syntax is as follows:

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

Usage

scanf function reads data from standard input according to the specified format stringformat And store it in the corresponding variable, and return the number of successfully read variables.

Steps

1. Specify the format string:
   format The string specifies the read data Format and variable types. For example: "%d" means reading an integer, "%f" means reading a floating point number.
2. Provide variable pointers:
   Every variable used in the format string must be passed by a pointer to the scanf function. For example: &num represents the address of variable num.
3. Calling the function:
   Call the scanf function and pass the format string and variable pointer as parameters. For example: scanf("%d", &num).

Example

Read an integer and a floating point number from the standard input. The code is as follows:

<code class="cpp">int num;
float fval;
scanf("%d %f", &num, &fval);</code>

Notes

• scanf The function skips leading spaces and tabs.
• scanf The function does not verify that the user input is of the correct type, thus potentially causing undefined behavior. The
• scanf function cannot read space characters. If you need to read spaces, you can use the getchar or gets function.

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