Pep and Nom

the ℕ𝕠𝕞 "increment tape pointer" or "++" command

Increment the tape pointer by one .

The command adds one to the “tape” pointer. The command is written

 ++ or >

Note that the only part of the machine state which has changed is that the 'tape-pointer' (the arrow in the 'tape' structure) has been incremented by one cell.

This command allows the tape to be accessed as a tape . This is tautological but true. Being able to increment and 'decrement' the tape pointer allows the script writer and the virtual machine to access any value on the tape using the 'get' and 'put' commands.

It should be remembered that the 'push' command also automatically increments the tape pointer, in order to keep the tape pointer and the stack in synchronization.

Since the “get” command is the only way to retrieve values from the tape the “++;” and “--;” commands are necessary. The tape cannot be accessed using some kind of array index because the get and 'put' commands to not have any arguments.

An example, the following script will print the string associated with the “value” token.

 pop;pop; "field*value*" { ++; get; --; print; }