Compilare: user.cpp: In function ‘int main()’: user.cpp:37:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] str[w_poz] = 'E'; ^ user.cpp:72:13: warning: statement has no effect [-Wunused-value] first_e; ^ user.cpp:12:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d\n", &n); ^ user.cpp:14:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", str); ^ user.cpp:41:13: warning: ‘last_e’ may be used uninitialized in this function [-Wmaybe-uninitialized] j = last_e; ^ user.cpp:36:18: warning: ‘w_poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] number = w_poz; ^ user.cpp:40:14: warning: ‘first_e’ may be used uninitialized in this function [-Wmaybe-uninitialized] i = first_e; ^