The C comparison functions below always takes two arguments, while the
Scheme functions can take an arbitrary number. Also keep in mind that
the C functions return one of the Scheme boolean values
`SCM_BOOL_T`

or `SCM_BOOL_F`

which are both true as far as C
is concerned. Thus, always write ```
scm_is_true (scm_num_eq_p (x,
y))
```

when testing the two Scheme numbers `x`

and `y`

for
equality, for example.

— Scheme Procedure: **=**

— C Function:**scm_num_eq_p** (`x, y`)

— C Function:

Return

`#t`

if all parameters are numerically equal.

— Scheme Procedure: **<**

— C Function:**scm_less_p** (`x, y`)

— C Function:

Return

`#t`

if the list of parameters is monotonically increasing.

— Scheme Procedure: **>**

— C Function:**scm_gr_p** (`x, y`)

— C Function:

Return

`#t`

if the list of parameters is monotonically decreasing.

— Scheme Procedure: **<=**

— C Function:**scm_leq_p** (`x, y`)

— C Function:

Return

`#t`

if the list of parameters is monotonically non-decreasing.

— Scheme Procedure: **>=**

— C Function:**scm_geq_p** (`x, y`)

— C Function:

Return

`#t`

if the list of parameters is monotonically non-increasing.

— Scheme Procedure: **zero?**` z`

— C Function:**scm_zero_p** (`z`)

— C Function:

Return

`#t`

ifzis an exact or inexact number equal to zero.