0 is zero
1 is nonzero
0 is less than or equal to 1
1 is greater than 0
0 is less than 1
1 is greater than or equal to 0
-1 is nonzero
0 is zero
-1 is less than or equal to 0
0 is greater than -1
0 is greater than or equal to -1
-1 is less than 0
