snprintf是否会自动将字符串末尾填''？

Let len be the length of the formatted data string (not including the terminating null). len and count are in bytes for _snprintf, wide characters for _snwprintf.

If len <count, then len characters are stored in buffer, a null-terminator is appended, and len is returned.

If len = count, then len characters are stored in buffer, no null-terminator is appended, and len is returned.

If len >count, then count characters are stored in buffer, no null-terminator is appended, and a negative value is returned.

"如果字符串很长，超过了buffer的size，是否会截断后还是在buffer末尾添'\0'？"

If len >count, then count characters are stored in buffer, no null-terminator is appended, and a negative value is returned.

回答完毕。

以上是vc里ok，linux下的snprintf截断后会添加'\0'，这个要注意。

这个和 *** 作系统没有直接联系 和语言编译器有关.

C/C++编译器在Linux通常gcc/g++ 在编译的时候自动会给用“”的字符串加‘\0’

字符串截断符和语言有关.

c语言字符串的结束符是 '\0' 也就是ASCII 码 0

不知道你注意到没有，我没有加 Linux，是因为这时 C 语言规定，跟 *** 作系统无关，在 Windows 下也是一样

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