Compilare: user.cpp: In function ‘int main()’: user.cpp:13:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= strlen(sir); i++ ) ^ user.cpp:16:30: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(sir[i] == '(') b++; ^ user.cpp:15:30: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(sir[i] == ')') a++; ^