Compilare: user.cpp: In function ‘int main()’: user.cpp:13:25: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(x+1,2000002,f); ^ user.cpp:14:25: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(y+1,2000002,f); ^