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◕ This article is regarding **Floating points numbers.**

Last updated on: 01st January 2017.

◕ What is **Floating points numbers**?

After **integer types** the **floating point types** are the second major group of fundamental C++ types.

A **floating point type** number represents a number with fractional parts, such as the value of a pie = 3.142.

A **floating point type** also provides a much greater range in values.

For an example,

If we want to represent the number of the bacterial cells in a human body, which is estimated to be greater than 100,000,000,000,000 and we are unable to
represent the number with **type int**, then we can use one of the **floating point types**.

◕ Floating Point Types

There are three **floating point types**: float, double, and long double.

In general float is 32 bits, double is 64 bits, and long double is 80, 96, or 128 bits.

All these **floating point types** has the following things:

**
- Significant figures** which floating point types can represent.

- The minimum allowable **range of exponents.
**

▨ Significant figures:

Significant figures are the meaningful digits in a number.

Example:

The population of India is almost 125 crore.

Here the number has 3 significant figures.

Another example:

If we write the length of a wire as 100.25 meters.

Then the number of the significant figures will be 5.

Please note that:

The number of significant figures does not depend on the location of the decimal point.

▨ Allowable range of exponents:

The range of exponents for all three **floating point types** are at least from –37 to +37.

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Floating Point Constants

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Integer Type in C++

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Rules for Variable Names

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Fundamental Data Types & Compound Data Types

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