Range of types

1. Integer types

2.float and double The scope of the

 

 

notes ：inf For infinity ,nan For there is no such thing

float Single precision , Less precise values can be expressed .

double Double precision , Can express more precise values , Less error .

3. Scientific enumeration

%E or %e

1E-10 by 1×10 negative 10 Power

4. Determine whether two floating-point numbers are equal

5. Type conversion

Forced type conversion

（int）10.2：10.2 Of double Turn into int----10