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Double in Dart #

In the previous video, We talked about the numbers in Dart. In this video I’ll talk about double in dart.

How to define/declare a double variable ?

main.dart
double variable_name_2;

How to define/declare a double variable with value ?

main.dart
double variable_name_2 = 3.5;

Once you declare a variable with it’s type name after that computer will remember that this label is of type integer or double or whatever type you have wrote in the program.

In dart integer is refereed as int

Example 1 #

In this example we will define/declare a variable x of double(decimal number) type, after that we will assign some value to x.

main.dart
int main(){
    double x;
    x = 3.14;
    print(x);
}

You can assign some value to the variable at the time of variable declaration also.

Example 2 #

Here I defined a variable x with the initial value of 3.14.

main.dart

int main(){
    double x = 3.14;
    print(x);
}

Operation on Numeric #

There are various operation which can be performed on Number.

What operation can be performed on Numbers. You can almost perform all the mathematical operation on the number.

Basic Mathematics Operation #

  • Sum (Addition)
  • Difference (Subtract)
  • Product (Multiply)
  • Division

Sum of Double #

main.dart
int main(){
    double x = 1.20; 
    double y = 0.30;
    double z = x + y;
    print(z);   // Result will be 1.50
}

Difference of Double #

main.dart
int main(){
    double x = 1.20; 
    double y = 0.30;
    double z = x - y;
    print(z);   // Result will be 0.90
}

Product of Double #

main.dart
int main(){
    double x = 1.20; 
    double y = 0.30;
    double z = x * y;
    print(z);   // Result will be 3.60
}

Division of Double #

main.dart
int main(){
    double x = 1.20; 
    double y = 0.30;
    double z = x / y;
    print(z);   // Result will be 4.0
}