java 大数操作（加减乘除及取余）

package hdu;
import java.util.*;
import java.text.*;
import java.math.*;
public class bignumber {

public static void main(String[] args) {
// TODO 自动生成的方法存根
Scanner cin=new Scanner(System.in);
while(cin.hasNext())
{
BigInteger a,b,c;
//int n=cin.nextInt();
// for(int i=1;i<=n;i++)
// {
// a=cin.nextBigInteger();
// b=cin.nextBigInteger();
// System.out.print("Case ");
// System.out.println(i+":");
// System.out.println(a+" + "+b+" = "+a.add(b));
// if(i!=n)
// System.out.println();
// }
// }
a=cin.nextBigInteger();
b=cin.nextBigInteger();
c=b;
System.out.println("加法操作");
System.out.println(a+" + 2*"+b+" = "+a.add(b.add(c)));//加
System.out.println("减法操作");
System.out.println(a+" - "+b+" = "+a.subtract(b));//减
System.out.println("乘法操作");
System.out.println(a+" * "+b+" = "+a.multiply(b));//乘
System.out.println("除法操作");
System.out.println(a+" / "+b+" = "+a.divide(b));//除
System.out.println("取余操作");
System.out.println(a+" % "+b+" = "+a.remainder(b));//取余
}
}

}