(xemacs.info)RegNumbers

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10.5 Keeping Numbers in Registers
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There are commands to store a number in a register, to insert the
number in the buffer in decimal, and to increment it.  These commands
can be useful in keyboard macros (Note: Keyboard Macros).

`C-u NUMBER C-x r n REG'
     Store NUMBER into register REG (`number-to-register').

`C-u NUMBER C-x r + REG'
     Increment the number in register REG by NUMBER
     (`increment-register').

`C-x r g REG'
     Insert the number from register REG into the buffer.

   `C-x r g' is the same command used to insert any other sort of
register contents into the buffer.