How to use scanf in c++

The scanf() function in C reads formatted data from standard input and stores it in a variable. The syntax is: int scanf(const char *format, ...), where format specifies the type and format of the read data, and ... is the address of the variable to store the read data. Usage: 1. Specify the format string and use the specifiers %d, %f, %c, %s to specify the data type; 2. Use the & operator to get the variable address; 3. Call the scanf() function and pass in format and variable address as parameters.

The scanf() function in C is used to read from the standard input Format and store data into the specified variable. The following is its syntax:

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

Where:

format:

A format string specifying the type and format of the data to be read.
• ...:
The address of the variable to store the read data.
How to use scanf()

#Specify the format string:

Format strings use the following format specifiers Specify the data type to read:

SpecifierData type%dInteger%fFloating point number%cCharacter%sString##Use the & operator Get the variable address: In order to store the read data into a variable, you need to use the & operator to get the address of the variable. For example, if you want to read an integer into variable i, you would use &i.

2. Calling scanf(): Call the scanf() function using format and variable address as parameters.
3. Example:

<code class="cpp">int main() {
  int i;
  float f;
  scanf("%d %f", &i, &f);
  // ...
}</code>

This will read an integer i and a float f from standard input.

Note:

scanf() function returns the number of successfully read variables. If no variables were read, 0 is returned.

The format string must specify a specifier that matches the type of data to be read. Otherwise, undefined behavior results.

• The scanf() function does not automatically skip spaces or tabs, so these characters need to be taken into account in the formatted string.

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