The meaning of %s in c language

%s is a format specifier in the C language for input or output strings. It indicates reading or writing a null-terminated character sequence.

The meaning of %s in C language

In C language, %s Is a format specifier used to output strings.

Detailed description:

When using input/output functions such as printf() or scanf(), the format The format specifier specifies the type and format of the data to be input or output. %s The format specifier is used to specify a string.

A string is a sequence of zero or more characters, terminated by a null character (\0). Therefore, %s instructs the function to read or write a null-terminated sequence of characters.

Example:

<code class="c">#include <stdio.h>

int main() {
    char name[20];

    printf("请输入您的姓名：");
    scanf("%s", name);

    printf("您的姓名是：%s\n", name);

    return 0;
}</code>

In this example:

• ##scanf("%s", name) Reads a string from the user and stores it in the name array until a space or newline character is encountered.
• printf("%s\n", name) Print the string in the name array to the console in the form of a string.

It should be noted that:

• %s The format specifier only reads or writes starting with null characters The ending string.
The length of a string is determined by its null character termination. Therefore, when using
• %s, you must ensure that the buffer provided is large enough to accommodate the input string.
If the input string exceeds the buffer size, it may exceed the buffer range and cause undefined behavior.

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