Need a simple calculator during editing a file using vim and don’t want to click away from it? Then first add the following to your
In order to use the calculator while you are editing some file using vim, hit CTRL-C in the insert mode and then enter what you want to calculate (e.g., 2+3 or 4.5*7.9).
(It) first calls the built-in
input()function to request the user to type in their calculation, which
input()then returns as a string. That input string is then passed to the built-in
eval(), which evaluates it as a Vimscript expression and returns the result. Next, the built-in
string()function converts the numeric result back to a string, which the key-mapping’s
<C-R>=sequence is then able to insert.