Inside Macintosh: PowerPC Numerics / Part 2 - The PowerPC Numerics C Implementation

Chapter 9 - Conversion Functions

Converting Between Floating-Point Formats

In the C programming language, conversions between floating-point formats are automatic when you assign a floating-point number of one type to a variable of another type.

float f = 0.0f;         /* single format */
double d = 1.1;
long double ld;         /* double-double format */

f = d;      /* double 1.1 converted to single format */
ld = f;     /* single 1.1 converted to double-double format */
d = ld;     /* double-double 1.1 converted to double format */