Find last index of a character in a string | GeeksforGeeks

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You should at least provide C/STL solutions for problems such as this. It's useful on the one hand to know how to solve the problem in the abstract, but it is typically not a good idea to roll your own solutions in code when standard library functions have been provided to perform the same task (because: 1) code correctness; 2) code bloat). In real world software we are encouraged to always use standard template library methods and algorithm functions for C++ code - as this example is - and standard C library functions where possible for C code.

E.g.:

const char* p;
int index = (int)(((p = std::strrchr(str.c_str, x)) != nullptr) ? (std::ptrdiff_t)(p - str.c_str) : (std::ptrdiff_t)-1);

or:

int index = (int)str.rfind(x);