Main.cc: In function 'int main()': Main.cc:17:19: warning: format '%lf' expects a matching 'double' argument [-Wformat=] printf("%.2lf,x"); ^ Main.cc:21:19: warning: format '%lf' expects a matching 'double' argument [-Wformat=] printf("%.2lf,x") ^ Main.cc:22:2: error: expected ';' before '}' token } ^