Double Data Type
Double (double-precision floating-point) variables are stored as 64-bit numbers (8 bytes) ranging in value from -1.79769313486232E308 to -4.94065645841247E-324 for negative values and from 4.94065645841247E-324 to 1.79769313486232E308 for positive values. The type-declaration character for a Double is # (ANSI character 35).
Note Double-precision floating-point numbers are stored in memory using IEEE 64-bit floating-point format. Each floating-point value consists of three parts: the sign, the exponent, and the mantissa. In a double-precision number, the sign takes 1 bit, the exponent takes 11 bits, and the mantissa uses the remaining 52 bits plus an additional implied bit.
Single Data Type
Visual Basic Data Types