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Internationalizing Applications
Using Multi-byte Code Pages : Inside the multi-byte application : Distinguishing characters, bytes, and columns

Distinguishing characters, bytes, and columns

To process multi-byte characters correctly, you need to understand the difference between characters, columns, and bytes:
*Characters are symbols in a code page, each of which is assigned a numeric value
*Bytes are units of storage, each consisting of eight bits
*Columns are units of width, indicating how much width a symbol requires on the monitor or on a printed report
To clarify, examine the following table, which shows two characters, one single-byte and one double-byte, and the byte and column count of each.
Table 14. Byte count and column count
Number of bytes
Number of columns