Compilare: user.cpp: In function ‘int main()’: user.cpp:15:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(t); i++) ^ user.cpp:19:43: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if((t[i+1]>=' '&& t[i+1]<='@')&& (t[i] >= 'a' && t[i]<='z')||(t[i]>='A'&&t[i]<='Z')) ^ user.cpp:26:39: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if((t[i]>=' '&& t[i]<='@')&& (t[i+1] >= 'a' && t[i+1]<='z')||(t[i+1]>='A'&&t[i+1]<='Z')) ^