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A double is a data type. It is a floating-point number that has 64 bits of space.


Doubles are commonly used for large numbers in programming. Being floating-point numbers, doubles can hold decimal precision.


Doubles can be used for arithmetic expressions such as addition, multiplication, division in programming. It is functionally similar to a float data type, however, it can hold twice as much data. This means that the numbers used in a double can be twice as large or twice as accurate as that of a float.

double a = 5; 
double b = 2.5;
double result1, result2, result3; // You can also declare several variables of the same type this way.

result1 = a + b; // result1 = 7.5
result2 = a * b; // result2 = 12.5
result3 = a / b; // result3 = 2;

See also