Data types : Floating Point Constants

Question

The C language has three mandatory real floating point types, float, double, and long double.

Answer 1

The C language has three mandatory real floating point types, float, double, and long double.

float f = 0.314f;                        /* suffix f or F denotes type float */

     double d = 0.314;                 /* no suffix denotes double */

long double ld = 0.314l; /* suffix l or L denotes long double */ 

/* the different parts of a floating point definition are optional */

double x = 1.; /* valid, fractional part is optional */

double y = .1; /* valid, whole-number part is optional */ 

/* they can also defined in scientific notation */

double sd = 1.2e3; /* decimal fraction 1.2 is scaled by 10^3, that is 1200.0 */

The header <float.h> defines various limits for floating point operations.

 

Floating point arithmetic is implementation defined. However, most modern platforms (arm, x86, x86_64, MIPS) use IEEE 754 floating point operations.

C also has three optional complex floating point types that are derived from the above.