Floating points number

[Rakanoth]

what is the diffrences between regular float data double precision and long double precision and what is double precision

[MiiNiPaa]

float: 24 significant bits of mantissa, 8 bits exponent
http://en.wikipedia.org/wiki/Single-precision_floating-point_format

double: 53 significant bits of mantissa, 11 bits exponent
http://en.wikipedia.org/wiki/Double-precision_floating-point_format

long double: 64 bits of mantissa, 15 bits exponent.
http://en.wikipedia.org/wiki/Extended_precision