Compilare: user.cpp: In function ‘int main()’: user.cpp:15:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size();i++) ^ user.cpp:62:49: warning: ‘prec’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(isdigit(s[i])==0 && nrnr!=0 && prec==')') ^ user.cpp:57:31: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] cant[++p]=cant[poz]+nr; ^ user.cpp:54:13: warning: ‘ok’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(ok==1) ^