1 import java.util.*;
2 import java.math.*;
3 import java.text.*;
4 import java.io.* ;
5
6 public class testjava{
7 public static void main( String args[] ){
8 Scanner cin = new Scanner(new BufferedInputStream(System.in));
9 BigInteger a,b;
10 while( cin.hasNext() ){
11 BigInteger t1,t2,t3,t4,t5;
12 a = cin.nextBigInteger();
13 b = cin.nextBigInteger();
14 t1 = a.add( b );
15 t2 = a.subtract( b );
16 t3 = a.multiply( b );
17 t4 = a.divide( b );
18 t5 = a.mod( b );
19 System.out.println( "和"+t1 );
20 System.out.println( t2 );
21 System.out.println( t3 );
22 System.out.println( t4 );
23 System.out.println( t5 );
24 //加减乘除+余数
25 int s1;
26 double s2;
27 s1 = t1.intValue();
28 s2 = t2.doubleValue();
29 System.out.println( s1 );
30 System.out.println( s2 );
31 //int，double转化位大数
32 BigDecimal d1;
33 BigDecimal d2 = new BigDecimal("3.141596");
34 System.out.println( d2 );
35 d2 = d2.setScale( 2,BigDecimal.ROUND_HALF_EVEN);
36 //小数位控制
37 System.out.println( d2 );
38 d1 = new BigDecimal( t1 );
39 System.out.println( d1 );//构造方法
40 //大整数转化为Decimal
41
42
43 int array_int[] = new int[10];
44 BigInteger array_Big[] = new BigInteger[10];
45 //数组的声明
46 array_Big[9]=BigInteger.valueOf(9);//大整数赋值
47 System.out.println( array_Big[9] );
48
49 }
50 }
51 }
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