Compilare: user.cpp: In function ‘int gaseste(std::string, char)’: user.cpp:10:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s1.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:28:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size();i++) ^ user.cpp: In function ‘int gaseste(std::string, char)’: user.cpp:12:1: warning: control reaches end of non-void function [-Wreturn-type] } ^