Compilare: user.cpp: In function ‘int main()’: user.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=2;i<strlen(s);i++) ^ user.cpp:45:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s11);i++) ^ user.cpp:81:23: warning: unused variable ‘aux1’ [-Wunused-variable] char aux[25]; int aux1; ^