关于大数的四则运算

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　　本文是在我的另一个博客中copy过来的，感觉博客园比较适合写代码就迁过来了

　　好久都没有写过日志了，前两天去面试，看到面试题中有关于大数操作的问题，所以回来以后就总结了一下，供笔试着还有要参加acm的同学做一些参考。

先说一下大数相加：

package com.my.lucene;

 
import java.math.BigInteger;

 
public class test {
public static void main(String[] args) {
String a = "15432321321223123231321"; String  b = "2121212121214354343544354354";
BigInteger bg = new BigInteger(a);
BigInteger gBigInteger= bg.add(new BigInteger(b));
System.out.println(gBigInteger);
}
}
大数相减： 
package com.my.lucene;


import java.math.BigInteger;


public class test {
public static void main(String[] args) {
String a = "15432321321223123231321"; String  b = "2121212121214354343544354354";
BigInteger bg = new BigInteger(a);
BigInteger gBigInteger= bg.subtract(new BigInteger(b));
System.out.println(gBigInteger);
}
}

 

大数相乘：

package com.my.lucene;


import java.math.BigInteger;


public class test {
public static void main(String[] args) {
String a = "15432321321223123231321"; String  b = "2121212121214354343544354354";
BigInteger bg = new BigInteger(a);
BigInteger gBigInteger= bg.multiply(new BigInteger(b));
System.out.println(gBigInteger);
}
}
大数除法：
package com.my.lucene;


import java.math.BigInteger;


public class test {
public static void main(String[] args) {
String a = "15432321321223123231321"; String  b = "2121212121214354343544354354";
BigInteger bg = new BigInteger(a);
BigInteger gBigInteger= bg.divide(new BigInteger(b));
System.out.println(gBigInteger);
}
}

大数相减：

package com.my.lucene;


import java.math.BigInteger;


public class test {
public static void main(String[] args) {
String a = "15432321321223123231321"; String  b = "2121212121214354343544354354";
BigInteger bg = new BigInteger(a);
BigInteger gBigInteger= bg.subtract(new BigInteger(b));
System.out.println(gBigInteger);
}
}