How to convert char to int?

I have some problem about how to convert char to int. For example I have number 0-9 in char then i want to convert these to number 0-9 in int. Can anyone tell me how to do it ? thank you

If it is a single digit

  char aChar = '5';
  int aNumber = aChar - '0';

thank a lot. ;)))

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But what is the question exactly?

how to convert char to integer.

'Q' is a char. What should the int be that 'Q' is converted to?