Compilare: user.cpp: In function ‘int expresie(int, int)’: user.cpp:44:40: warning: unused variable ‘semn’ [-Wunused-variable] int i, c, pos, nr_left, nr_right, nr, semn; ^ user.cpp:157:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:164:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", &x[0]); ^