To program in C++. Is it possible to add and subtract the ascii value of a character to change the value.?

Question

I thought that basic mathematical operations would work, but it did not. I am thinking that if I could convert that character value to an integer and vice versa it would work to do the mathematic operation, but I am not certain if that is even possible. It would probably be in the string library I think?

Answer 1

You can take a character value (which is, after all, a numeric byte) and add or subtract from it. But it makes no sense to add one character to another. What is 'a' + 'b'? Nothing. But 'a' + 1 is 'b'.

Answer 2

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Answer 3

Yep, you need convert from ASCII to integer, do the math, then convert back. Sorry, forgot the function to perform that, but should be in docs.

Answer 4

Of course, it is possible to add/subtract ascii value of a char to change it's value. Take an example of a tolower(ch) function to convert uppercase char to a lowercase char. eg. 'B' to 'b'

#define isupper(ch) ( (ch) >= 'A' && (ch) <= 'Z' )
#define tolower(ch) ( isupper(ch) ? 'a' + (ch)-'A' : ch )

Note the operation to convert uppercase char to lowercase
'a' + (ch) - 'A'

Suppose the input char is 'B', the operation works out to be
'a' + 'B' - 'A'
= 'a' + 1
= 'b'

Answer 5

It is the true math.
ASCII is a signed 8-bit integer, so 'A' + ' ' = 'a'.