Why does subtracting ‘0’ in C result in the number that the char is representing?

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Because the char are all represented by a number and ‘0’ is the first of them all.

On the table below you see that:

'0' => 48
'1' => 49


'9' => 57.

As a result: ('9' – '0') = (57 − 48) = 9

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Source: http://www.asciitable.com

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