# Integer Constant.

**Q9. What is an integer constant? Write integer forming rule of C++.**

**Ans. **Integer constants are whole numbers without any fractional part.

The method of writing integer constants has been specified in the following rule:

An integer constant must have at least one digit and must not contain any decimal point. It may contain either + or – sign. A number with no sign is assumed to be positive. Commas cannot appear in an integer constant.