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The meaning of %s in c language

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%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

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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