Compilare: user.cpp: In function ‘int main()’: user.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<=s.length()-1; i++) ~^~~~~~~~~~~~~~ user.cpp:23:19: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(x>='A' and x<='Z' or x>='a' and x<='z') ~~~~~~~^~~~~~~~~~ user.cpp:38:12: warning: unused variable ‘y’ [-Wunused-variable] double y = modf(ered, &int_ered); ^