wiki wrote:
The following examples show the decimal separator and the thousands separator; the lists are ordered chronologically, by when each country adopted the use:
* In France, Finland, Hungary, Poland, Czech Republic, Slovakia and much of Latin Europe as well as French Canada: 1 234 567,89
* In Germany, the Netherlands, Belgium, Denmark, Italy, Romania, Sweden and much of Europe: 1 234 567,89 or 1.234.567,89 (in handwriting you may also come across 1·234·567,89)
* In Switzerland (mainly German-speaking Switzerland, but by law in the whole country): 1'234'567.89
* In Australia, English Canada, Japan, Korea (both), Malaysia, Singapore, the United Kingdom, and the United States: 1,234,567.89 or 1,234,567·89; the latter is more commonly found in older, and especially handwritten, documents; many British and Canadian schools now teach the SI style with a dot separator, which has become official in Australia.
* SI style: 1 234 567.89 or 1 234 567,89 (in their own publications the dot is used in the English version and the comma in the French version).
* In China, the comma is sometimes used to separate blocks of four digits: 123,4567.89, since in Chinese, the names for large numbers are based on powers of 10,000 (e.g. the next new word is for 108). Japan is similar.
* In India, due to a numeral system using lakhs (lacs) (1,00,000 equal to 100,000) and crores (1,00,00,000 equal to 10,000,000), comma is used at levels of thousand, lakh and crore, for example, 10 million (1 crore) would be written as 1,00,00,000. This is repeated at thousand crore, one lakh crore and a crore crore (1,00,00,000,00,00,000). Note that the pattern of comma is groups of 3,2,2 again 3,2,2 from right side.
In countries with a decimal comma, the decimal point is also common as the "international" notation because of the influence of devices, such as electronic calculators, which use the decimal point. Most computer operating systems allow selection of the decimal separator and programs that have been carefully internationalised will follow this, but some programs ignore it and a few are even broken by it.