Dart Number

The Number is the data type that is used to hold the numeric value. In Dart, It can be two types -

• Integer
• Double

Dart integer - Integer numbers are the whole numbers means that can be written without a fractional component. For example - 20, 30, -3215, 0, etc. An integer number can be signed or unsigned. The representation of the integer value is in between -263 to 263 non-decimal numbers. The int keyword is used to declare integer value in Dart.

Dart Double - The Double number are the numbers that can be written with floating-point numbers or number with larger decimal points. The double keyword is used to declare Double value in Dart.

Rules for the integer value

• An integer value must be a digit.
• The decimal points should not include in an integer number.
• Unsigned numbers are always a positive number. Numbers can be either negative or positive.
• The size of the integer value depends upon the platform, but integer value should no longer than 64 bit.

Let's have a look at following example -

Example -

Output:

The area of sphere 314 

Dart parse() function

The parse() function converts the numeric string to the number. Consider the following example -

Example -

Output:

The sum is = 36.19

Explanation -

In the above example, we converted the numeric strings into the numbers by using parse() method then stored in the variables. After the successful conversion, we performed add operation and printed the output to the screen.

Number Properties

Number Methods

The commonly used methods of number are given below.