C# compiler allocates 64 bits (8 bytes) to store a * double* variable type. For reference, a double variable type can keep values with a precision of 14 or 15 digits, in the interval between

*and*

**1.7E-308***.*

**1.7E+308**You should know that the * float *and the

*variable types are floating*

**double***binary*point types. In other words, they represent a number like this:

*.*

**10001.10010110011**The binary number and the location of the binary point are both encoded within the value.

** Decimal** (of which we will discuss in the next lesson) is a floating

*decimal*point type. In other words, they represent a number like this:

**12345.65789**The following image illustrates the representation of a double variable type:

**scientific notation.**This system allows to represent any number utilizing a single digit to the left of the point, an unlimited number of digits to the right of the point, and an exponent using a power of 10. When you calculate the real value of the number, multiply the number (mantissa) with the value of 10 to the

*x*power (where x represents the exponent). For instance, number 3.1415967E+7 equals to 31415967.0, or 3.1415967 * 10

^{7}

*.*

*The concepts explained in this lesson are also shown visually as part of the following video:*

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Tags: double variable, variable types, variables