Decimal and Thousands Separators

Great Britain and the United States are two of the few places in the world that use a period to indicate the decimal place. Many other countries use a comma instead. The decimal separator is also called the radix character. Likewise, while the U.K. and U.S. use a comma to separate thousands groups, many other countries use a period instead, and some countries separate thousands groups with a thin space. Table 1-3 shows some commonly used numeric formats.

Data files containing locale-specific formats will be misinterpreted when transferred to a system in a different locale. For example, a file containing numbers in a French format is not useful to a U.K.-specific program.