Dart Programming - Numbers

Published May 08, 2020

Dart numbers can be classified as −

int − Integer of arbitrary size. The int data type is used to represent whole numbers.
double − 64-bit (double-precision) floating-point numbers, as specified by the IEEE 754 standard. The double data type is used to represent fractional numbers

The num type is inherited by the int and double types. The dart core library allows numerous operations on numeric values.

Syntax

int var_name;      // declares an integer variable 
double var_name;   // declares a double variable

Example

void main() {
   // declare an integer
   int a= 10;             
     
   // declare a double value
   double b= 20.21;  

   // print the values
   print(a);
   print(b);
}

Output

10 
20.21

Parsing

The parse() static function allows parsing a string containing numeric literal into a number

void main() { 
   print(num.parse('11')); 
   print(num.parse('11.91')); 
}

Output

11 
11.91

Number Properties

Properties supported by Dart numbers.

Sr.No	Property & Description
1	hashCode Returns a hash code for a numerical value.
2	isFinite True if the number is finite; otherwise, false.
3	isInFinite True if the number is positive infinity or negative infinity; otherwise, false.
4	isNan True if the number is the double Not-a-Number value; otherwise, false.
5	isNegative True if the number is negative; otherwise, false.
6	sign Returns minus one, zero or plus one depending on the sign and numerical value of the number.
7	isEven Returns true if the number is an even number.
8	isOdd Returns true if the number is an odd number.

Number Methods

Number mtethods are below

Sr.No	Method & Description
1	abs Returns the absolute value of the number.
2	ceil Returns the least integer no smaller than the number.
3	compareTo Compares this to other number.
4	floor Returns the greatest integer not greater than the current number.
5	remainder Returns the truncated remainder after dividing the two numbers.
6	round Returns the integer closest to the current numbers.
7	toDouble Returns the double equivalent of the number.
8	toInt Returns the integer equivalent of the number.
9	toString Returns the string equivalent representation of the number.
10	truncate Returns an integer after discarding any fractional digits.

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Dart Programming - Numbers

Parsing

Number Properties

Number Methods

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