Author: Unknown
Subject: None
Date: Saturday, 24 Oct 2020, 14:47:03

When I add:
setvbuf (stdin,  bin,  _IONBF, 0);
setvbuf (stdout, bout, _IONBF, 0);

to main(), I get an error saying bin and bout are undeclared (first use in function). What are bin and bout signifying and how can we fix this?