java data type conversion

 

1  public  class ShuJuZhuanHuan {
 2      public  static  void main(String[] args) {
 3          int a1=123 ;
 4          int a2=456 ;
 5          double b1=(a1+a2)*1.2; // The system will convert to double operation 
6          float c1=( float )((a1+a2)*1.2); // Needs strong conversion character 
7          byte d1=1 ;
 8          byte d2=2 ;
 9          byte d3=( byte )(d1+d2); / / The system will convert to int type operation, which requires coercion 
10         double b2= 1e200;
 11          float c2=( float )b2; // will overflow 
12          System.out.println(c2);
 13          float c3=1.23f; // must add f 
14          long e1=123 ;
 15          long e2 =3000000000000L; // Must add L 
16          float c4 =e1+e2+c3; // The system will convert to float for calculation 
17          long e=( long )c4; // Force conversion will round off the fractional part (not round off) 
18      }
 19 }

data conversion

1          float f1=0.1; // If there is a problem, add F or cast 
2          long L1=8888888888; // Need to add L 
3          i=1/10; // The result is 0 
4          i=(i*0.1); // double Casting to int is lost

error prone

Program format:

a: brace alignment

b:Tab/Shift+Tab

c: add blank lines between program blocks

d: space between side-by-side statements

e: space around the operator

f:{ is preceded by a space

g: Pair programming