+   D+   M+

+ ( n1 n2 --- n3)

Addition of two signed single precision integers.

Example:

6 3  +
-6 3 +

D+ ( d1 d2 --- d3)

Addition of two signed double precision integers.

Example:

6. 3.  D+
-6. 3. D+

M+ ( d1 n1 --- d2)

Adds a single-precision signed integer n1 to a signed double-precision integer d1 and leaves on the stack a double-precision signed integer d2.

Example:

6. 3  M+