double data type in Java
The double data type is also a floating point number. It is called double because it has a double-precision decimal number.
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- The double data type is a floating point number.
- It is double precision data type
- The range is 4.9406564584124654 x 10-324 to 1.7976931348623157 x 10308. The number can be positive or negative.
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The double data type is also a floating point number. It is called double because it has a double-precision decimal number. The double data type has 15 digits of accuracy.
The double data type is stored in 64 bits of memory. 8 bits gives a byte so double has 8 bytes of memory.
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double has twice as much memory as the float data type.
double has a much larger range of possible values than the float type.
The range is 4.9406564584124654 x 10-324 to 1.7976931348623157 x 10308. The number can be positive or negative.
Declaring an double variable
We declare double the same as any other type :
double weight;
double height;
Alternatively, you can also declare all double variables in a row. That’s,
double height, weight;
Program demonstrates double data type
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//Program demonstrates the double data type public class DoubleVariable { public static void main(String[] args) { double amount, discount; //'amount' and 'discount' are both declared as double amount=50.5; //amount is assigned the double value, 50.5 discount=1.5; //discount is assigned the double value, 1.5 System.out.println("The amount is $" + amount + " and the discount is " + discount + "%"); } } |
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Writing floating point numbers in Scientific notation
A number in Scientific notation is in the form a×10^n where a>=1 and n is an integer.
We can write floating point numbers in scientific notation. Example: 2751632 can be written as 2.751632 × 10^6. You can also write 0.00001532 as 1532×10^-5.
In Java, the letter E or e is used to represent the figures in the scientific notation. That’s,
2.751632 × 10^6 is typed as 2.751632E6 in Java.
1532×10^-5 is typed as 1532e-5.
Program demonstrates floating point numbers in scientific notation
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//Program demonstrates floating point numbers in scientific notation public class ScientificFloat { public static void main(String[] args) { double distance=1.265432e12; System.out.print("The galaxies are " + distance + " meters apart"); } } |
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