Double Precision Floating Point Data Type

How is "double" datatype used in C++?.


The "double" precision floating point data type is used to represent floating point numbers that occupies 8 bytes. The range of values for the "double" datatype is between +/- 1.7e to +/- 308.

Example :

#include <iostream.h>
void main()
double a = 1000000.0;
cout << "Double Precision Floating Point is:" << a << '\n';
cout << "Bytes occupied is:" << sizeof(a);


Double Precision Floating Point is: 1e+06
Bytes occupied is: 8

In the above example, the value of the double floating point number is displayed along with the bytes occupied by the "double" data type.

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