Yes they can. The ASCII codes for the digits 0 to 9 are:
0 - 0030
1 - 0031
2 - 0032
3 - 0033
4 - 0034
5 - 0035
6 - 0036
7 - 0037
8 - 0038
9 - 0039
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Digits have ASCII kód '0'..'9' = 48..57
Ascii
Binary.
In the Argand diagram (complex plane), numbers on the horizontal axis represent real numbers.
ASCII