2.1.1.1.2. Floating Point Types
float

24 bit signed fraction, 8 bit signed exponent

double

53 bit signed fraction, 11 bit signed exponent

long double

113 bit signed fraction, 15 bit signed exponent

Values. 

3.14, 12.34e5, 1.2E-4

Constants. 

const float aFloatConstant = 3.141593;