Compilare: user.cpp: In function ‘int main()’: user.cpp:208:24: warning: statement has no effect [-Wunused-value] for (in; in <= stop; ++in) ^ user.cpp:51:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in_file, "%d", &n); ^ user.cpp:57:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in_file, "%d", &x); ^ user.cpp:62:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in_file, "%d %d", &x, &y); ^ user.cpp:75:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in_file, "%d %d", &x, &y); ^ user.cpp:85:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in_file, "%d", &x); ^