Compilare: user.cpp: In function ‘bool eval()’: user.cpp:37:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] r=b[s[ind]]; ^ user.cpp: In function ‘int main()’: user.cpp:97:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[ch] = !b[ch]; ^ user.cpp:97:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[ch] = !b[ch]; ^ user.cpp:82:24: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, 1500, fin); ^ user.cpp:94:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d\n", &t); ^ user.cpp:96:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%c", &ch); ^