Compile it like so: gcc -O3 jenny.c -o jenny Prebuilt Windows executable: jenny.exe (supplied by Derrick Pallas, I think the September 14 2003 version) Features tend to come in dimensions, where a testcase can choose one feature from each dimension. For example, the datatype of a variable is a dimension: the variable can have only one of several datatype. The variable can be compared to another va