What does %.2s mean in C language?

The meaning of %.2s in C language

In the formatted output function (such as printf()) of C language, "%.2s" means:

• %: Format specifier, indicating that the data will be output in a specific format.
• .: Precision indicator, indicating the length of the output string.
• 2: Specify the length of the output string to be 2 characters.
• s: Specify the output data type as string.

Therefore, the "%.2s" format specifier means to output a string of 2 characters in length. If you want to output a string of 10 characters in length, you can use the "%.10s" format specifier. If you want to output a string with no length limit, you can use the "%s" format specifier.

Example:

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

int main() {
  char str[] = "Hello";

  printf("输出长度为 2 个字符的字符串：%.2s\n", str);
  printf("输出长度为 10 个字符的字符串：%.10s\n", str);
  printf("输出没有长度限制的字符串：%s\n", str);

  return 0;
}</code>

Output:

<code>输出长度为 2 个字符的字符串：He
输出长度为 10 个字符的字符串：Hello     
输出没有长度限制的字符串：Hello</code>

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