- Scheme Procedure:
**odd?**`n`¶ - C Function:
**scm_odd_p**`(n)`¶ Return

`#t`

if`n`is an odd number,`#f`

otherwise.

- Scheme Procedure:
**even?**`n`¶ - C Function:
**scm_even_p**`(n)`¶ Return

`#t`

if`n`is an even number,`#f`

otherwise.

- Scheme Procedure:
**quotient**`n d`¶ - Scheme Procedure:
**remainder**`n d`¶ - C Function:
**scm_quotient**`(n, d)`¶ - C Function:
**scm_remainder**`(n, d)`¶ Return the quotient or remainder from

`n`divided by`d`. The quotient is rounded towards zero, and the remainder will have the same sign as`n`. In all cases quotient and remainder satisfy.`n`=`q`*`d`+`r`(remainder 13 4) ⇒ 1 (remainder -13 4) ⇒ -1

See also

`truncate-quotient`

,`truncate-remainder`

and related operations in Arithmetic Functions.

- Scheme Procedure:
**modulo**`n d`¶ - C Function:
**scm_modulo**`(n, d)`¶ Return the remainder from

`n`divided by`d`, with the same sign as`d`.(modulo 13 4) ⇒ 1 (modulo -13 4) ⇒ 3 (modulo 13 -4) ⇒ -3 (modulo -13 -4) ⇒ -1

See also

`floor-quotient`

,`floor-remainder`

and related operations in Arithmetic Functions.

- Scheme Procedure:
**gcd**`x…`¶ - C Function:
**scm_gcd**`(x, y)`¶ Return the greatest common divisor of all arguments. If called without arguments, 0 is returned.

The C function

`scm_gcd`

always takes two arguments, while the Scheme function can take an arbitrary number.

- Scheme Procedure:
**lcm**`x…`¶ - C Function:
**scm_lcm**`(x, y)`¶ Return the least common multiple of the arguments. If called without arguments, 1 is returned.

The C function

`scm_lcm`

always takes two arguments, while the Scheme function can take an arbitrary number.