Compilare: main.cpp: In function 'int findNr()': main.cpp:20:45: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | while (!isdigit(s1[pString]) && pString < s1.size()) | ~~~~~~~~^~~~~~~~~~~ main.cpp:25:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | while (isdigit(s1[pString]) && pString < s1.size()); | ~~~~~~~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:90:15: warning: unused variable 'ch' [-Wunused-variable] 90 | int n, i, ch, j; | ^~