Dart Programming - Numbers
Published May 08, 2020
Dart numbers can be classified as −
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int − Integer of arbitrary size. The int data type is used to represent whole numbers.
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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
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Example
void main() {
// declare an integer
int a= 10;
// declare a double value
double b= 20.21;
// print the values
print(a);
print(b);
}
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Output
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'));
}
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Output
Number Properties
Properties supported by Dart numbers.
Sr.No |
Property & Description |
1 |
hashCode
Returns a hash code for a numerical value.
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2 |
isFinite
True if the number is finite; otherwise, false.
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3 |
isInFinite
True if the number is positive infinity or negative infinity; otherwise, false.
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4 |
isNan
True if the number is the double Not-a-Number value; otherwise, false.
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5 |
isNegative
True if the number is negative; otherwise, false.
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6 |
sign
Returns minus one, zero or plus one depending on the sign and numerical value of the number.
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7 |
isEven
Returns true if the number is an even number.
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8 |
isOdd
Returns true if the number is an odd number.
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Number Methods
Number mtethods are below
Sr.No |
Method & Description |
1 |
abs
Returns the absolute value of the number.
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2 |
ceil
Returns the least integer no smaller than the number.
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3 |
compareTo
Compares this to other number.
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4 |
floor
Returns the greatest integer not greater than the current number.
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5 |
remainder
Returns the truncated remainder after dividing the two numbers.
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6 |
round
Returns the integer closest to the current numbers.
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7 |
toDouble
Returns the double equivalent of the number.
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8 |
toInt
Returns the integer equivalent of the number.
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9 |
toString
Returns the string equivalent representation of the number.
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10 |
truncate
Returns an integer after discarding any fractional digits.
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