In C++, "%s" is a crucial format control character. It is used to process the input and output operations of strings. It is similar to other common format characters such as %d and %f. usage. Let's go through an example to better understand its functionality.

First of all, when you need to get a string from the user, you can do this:

For example, declare a character array charstr[10]; and then use the scanf function, such as scanf ("%s",str);

This allows you to enter a string via the keyboard and store it in the specified array str.

On the other hand, if you want to display the string, you can use the printf function, such as printf("%s",str); This will print out the string stored in str.

In addition to %s, C++ also supports other format control characters, such as:

-

%c" is used to input or output a single character;

-

%p" represents the value of the output pointer;

-

%e" displays the floating-point number in exponential form;

-

%d,%i" is used for signed decimal integers;

-

%u" is used for unsigned decimal integers;

-

%u" is used for unsigned decimal integers;

-

p>

-

%f" is used to display floating point numbers;

-

%x,%X" is used in unsigned hexadecimal represents an integer;

-

%0" is used to represent an integer in unsigned octal;

-

Finally, %g" It automatically selects the most appropriate display format based on the size of the value.

Understanding and skillfully using these format control symbols can make you more comfortable in C++ input and output operations.