Do you mean a single character within a string? Just get the character,
e.g.
string h = "hello";
char c = h[3];
Now the character is the Unicode value, but all ASCII values are the
same in Unicode. So, for instance:
int i = c;
will make i be the ASCII code for 'l'.
(Converting to int isn't really necessary, but perhaps makes it
clearer.)
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