Free Pascal - 64-bit real number: double

64-bit real number and his value range: from - 1.7 × 10 on 308 to +1.7 × 10 on 308 and it has 15 digit precision. if it is used to store integers the biggest integer what can store without rounding is 2 on 53. 64-bit real number is stored the following way: 1bit sign, 8bit exponent a 23bit mantissa.

double

Description

double

Used keywords: double

Examples

Free Pascal

64-bit real number the possible of use:

x:= 3.14159265359;     // x = 3.14159265359
y:= 123456789;         // y = 123456789.0
y :=double((x * y));          // y = 387850941.35821074

You can find it in the following collections: real numbers | numbers | data types

64-bit real number in another programming language:

Differences to: