Answer by fluter for '\0' evaluates false, "\0" evaluates true

First, looking at the two conditions, '\0' is a constant of type integer, which denotes the null character C, which is the same as 0. While "\0" is a string literal, which contains 2 bytes, the one specified and the null terminator byte implicitly added. Being a string literal, the pointer cannot be NULL.

Second, in C, for the condition of if statement, everything non-zero is evaluated as true, and zero is evaluated as false.

According to this rule, it will be clear that '\0' is false, and "\0" evaluated as true.