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#### 6.6.2.8 Comparison Predicates

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)* Return

`#t`

if all parameters are numerically equal.

- Scheme Procedure:
**<** - C Function:
**scm_less_p***(x, y)* Return

`#t`

if the list of parameters is monotonically increasing.

- Scheme Procedure:
**>** - C Function:
**scm_gr_p***(x, y)* Return

`#t`

if the list of parameters is monotonically decreasing.

- Scheme Procedure:
**<=** - C Function:
**scm_leq_p***(x, y)* Return

`#t`

if the list of parameters is monotonically non-decreasing.

- Scheme Procedure:
**>=** - C Function:
**scm_geq_p***(x, y)* Return

`#t`

if the list of parameters is monotonically non-increasing.

- Scheme Procedure:
**zero?***z* - C Function:
**scm_zero_p***(z)* Return

`#t`

if`z`is an exact or inexact number equal to zero.

- Scheme Procedure:
**positive?***x* - C Function:
**scm_positive_p***(x)* Return

`#t`

if`x`is an exact or inexact number greater than zero.

- Scheme Procedure:
**negative?***x* - C Function:
**scm_negative_p***(x)* Return

`#t`

if`x`is an exact or inexact number less than zero.

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