Change all accented letters to normal letters in C++

Question

The question

How can you change all accented letters to normal letters in C++ (or in C)?

By that, I mean something like eéèêaàäâçc would become

Answer 1

Here is what you can do using ISO/IEC 8859-1 (ASCII-based standard character encoding):

• if code range is from 192 - 197 replace with A
• if code range is from 224 - 229 replace with a
• if code range is from 200 - 203 replace with E
• if code range is from 232 - 235 replace with e
• if code range is from 204 - 207 replace with I
• if code range is from 236 - 239 replace with i
• if code range is from 210 - 214 replace with O
• if code range is from 242 - 246 replace with o
• if code range is from 217 - 220 replace with U
• if code range is from 249 - 252 replace with u

Supposing x is the code of the number, perform the following for capital letters:

• y = floor((x - 192) / 6)
• if y <= 2 then z = ((y + 1) * 4) + 61 else z = (y * 6) + 61

Perform the following for small letters:

• y = floor((x - 224) / 6)
• if y <= 2 then z = ((y + 1) * 4) + 93 else z = (y * 6) + 93

The final answer z is the ASCII code of the required alphabet.
Note that this method works only if you are using ISO/IEC 8859-1.