0=   =   <>   <   >   0<   u>   u<   within

0= ( x --- fl)

flag is true if and only if x is equal to zero.

Example:

5 0=      \ push  FALSE on stack
0 0=      \ push  TRUE  on stack

= ( x1 x2 --- fl)

flag is true if and only if x1 is equal x2.

Example:

5 5 =      \ push  TRUE  on stack
5 4 =      \ push  FALSE on stack

<> ( x1 x2 --- fl)

flag is true if and only if x1 is different x2.

Example:

5 5 <>      \ push  FALSE on stack
5 4 <>      \ push  TRUE  on stack

< ( x1 x2 --- fl)

Test if x1 is less than x2.

> ( x1 x2 --- fl)

Test if x1 is greater than x2.

0< ( x1 --- fl)

Test if x1 is less than zero.

u> ( x1 x2 --- fl)

Tests if x1 is greater than x2 in absolute values.

u< ( x1 x2 --- fl)

Tests if x1 is less than x2 in absolute value.

within ( x1 x2 x3 --- fl)

Tests if the value x1 is in the range x2 x3.