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From the documentation:
https://www.cplusplus.com/reference/cstring/strncpy/
No null-character is implicitly appended at the end of destination if source is longer than num. Thus, in this case, destination shall not be considered a null terminated C string (reading it as such would overflow).
In general, you need to manually add a '\0' to terminate the string when using strncpy
于 2021-07-24T00:08:08.037 回答