What is ‘\0’ in C++?

'\0' equals 0. It’s a relic from C, which doesn’t have any string type at all and uses char arrays instead. The null character is used to mark the end of a string; not a very wise decision in retrospect – most other string implementations use a dedicated counter variable somewhere, which makes finding the end of a string O(1) instead of C’s O(n).

*asmcmd=='\0' is just a convoluted way of checking length(asmcmd) == 0 or asmcmd.is_empty() in a hypothetical language.

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