Radix point


In mathematics and computing, a radix point is the symbol used in numerical representations to separate the integer part of a number from its fractional part. "Radix point" applies to all number bases. In base 10 notation, the radix point is more commonly called the decimal point, where the prefix implies base 10. Similarly, the term "binary point" is used for base 2.
In English-speaking countries, the radix point is usually a small dot placed either on the baseline or halfway between the baseline and the top of the numerals. In many other countries, the radix point is a comma placed on the baseline. It is important to know which notation is being used when working in different software programs. The respective ISO standard defines both the comma and the small dot as decimal markers, but does not explicitly define universal radix marks for bases other than 10.

Examples

Power of 23210−1−2−3
Binary digit1101.101

Hence, its decimal value can be calculated as:
It is now seen that 1101, which is to the left of the radix point, is the binary representation of the decimal number 13. To the right of the radix point is 101, which is the binary representation of the decimal fraction 625/1000.