Compilare: user.cpp: In function ‘int main()’: user.cpp:15:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(v);i++) ^ user.cpp:16:16: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(v[i]>='a'&&v[i]<='z'||v[i]>='A'&&v[i]<='Z') ^