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# Zero
Zero (0) is a [number](number.md) signifying the absence of a thing we count. It precedes [1](one.md) and follows -1.
Zero (0) is a [number](number.md) signifying the absence of a thing we count. Among integers it precedes [1](one.md) and follows -1.
Some properties of and facts about this number follow:
@ -21,7 +21,7 @@ Some properties of and facts about this number follow:
- In [C](c.md) and many other languages 0 represents the [false](false.md) value, a function returning 0 many times signifies an [error](error.md) during the execution of that function. However 0 also sometimes means success, e.g. as a return value from the main function. 0 is also often used to signify [infinity](infinity.md), no limit or lack of value (e.g. [NULL](null.md) pointer normally points to address 0 and means "pointing nowhere").
- [Historically](history.md) the concept of number zero seems to have appeared at least 3000 BC and is thought to signify an advanced abstract thinking, though it was first used only as a positional symbol for writing numbers and only later on took the meaning of a number signifying "nothing".
**Dividing by zero is not defined**, it is a forbidden operation mainly because it breaks equations (allowing dividing by zero would also allow us to make basically any equation hold, even those that normally don't). In programming dividing by zero typically causes an error, crash of a program or an [exception](exception.md). In some programming languages [floating point](float.md) division by zero results in [infinity](infinity.md). When operating with [limits](limit.md), we can handle divisions by zero in a special way (find out what value an [expression](expression.md) approaches if we get infinitely close to dividing by 0).
**Dividing by zero is not defined**, it is a forbidden operation mainly because it breaks equations (allowing dividing by zero would also allow us to make basically any equation hold, even those that normally don't). In programming dividing by zero typically causes an error, crash of a program or an [exception](exception.md). In some programming languages [floating point](float.md) division by zero results in [infinity](infinity.md) or [NaN](nan.md). When operating with [limits](limit.md), we can handle divisions by zero in a special way (find out what value an [expression](expression.md) approaches if we get infinitely close to dividing by 0).
## See Also