Compilare: user.cpp:13:10: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main(void) ^ user.cpp: In function ‘int main()’: user.cpp:19:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=p+1;i<s.length(),u<1;++i){ ^ user.cpp:19:31: warning: value computed is not used [-Wunused-value] for(i=p+1;i<s.length(),u<1;++i){ ^