When told to print no more than n bytes, snprintf guarantees that it creates a string of length no more than n-1, with a null terminator at the end of the string.

当被告知输出不超过 n 个字节时， snprintf 保证会创建一个长度不超过 n-1 的字符串，字符串最后是一个空结束符。

youdao

So int n just gives me four bytes for an int, but it doesn't put anything there yet.

所以int，n只是给我们分配了4个字节，但是它没有放任何东西在那里。

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