Compilare: user.cpp: In function ‘int main()’: user.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:10:7: warning: unused variable ‘n’ [-Wunused-variable] { int n,i,x; ^ user.cpp:10:11: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] { int n,i,x; ^ user.cpp:11:16: warning: unused variable ‘rez’ [-Wunused-variable] long long nr=0,rez=0; ^