Compilare: user.cpp: In function ‘int main()’: user.cpp:14:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(p);i++) ^ user.cpp:15:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(p[i]>='a' && p[i]<='z' || p[i]>='A' &&p[i]<='Z') ^