Convert decimal hex

Question

Given a list of decimal numbers, how can each number be converted to its equivalent hexadecimal value, and vice versa? For example: ``` (convert2hex 255 64 64); -> (FF 40 40) (convert2dec FF 40 40); -> (255 64 64) (convert2hex 255 64 64 255 64 64 128) (convert2dec FF 40 40 FF 40 40 80) ```

Accepted Answer

Number to Hex:

```
(format "%X" 255) ;; => "FF"
```

You can also zero-pad the value with:

```
(format "%03X" 255) ;; => "0FF"
```

Where the `0` is the character to use for padding and `3` is the number of spaces to pad.

Hex string to number

```
(string-to-number "FF" 16) ;; => 255
```

The `16` means "read as base-16."

Convert decimal <-> hex

Solution

Problem