Compilare: user.cpp: In function ‘short int ucp(char*)’: user.cpp:21:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(nr);i++) ^ user.cpp: In function ‘void scadere(char*)’: user.cpp:67:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else {while(nr[strlen(nr)-i]-'0'==0&&i<strlen(nr)) ^ user.cpp: In function ‘int main()’: user.cpp:86:11: warning: unused variable ‘sum’ [-Wunused-variable] short sum; ^ user.cpp: In function ‘short int ucp(char*)’: user.cpp:63:1: warning: control reaches end of non-void function [-Wreturn-type] } ^