代码范例-进制转换[数组]

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[Java]]二进制转十进制,十进制转十六进制:

public class binary {    public static void main(String[] args) {        tobin(6);        tohex(60);    }    //二进制转换为十进制    public static void tobin(int num)    {    //定义一个临时存储容器        StringBuffer sb=new StringBuffer();        while(num>0)        {            sb.append(num%2);            num=num/2;        }        System.out.println(sb.reverse());//实现反转    }    //十进制转换为十六进制    public static void tohex(int num)    {        StringBuffer sb =new StringBuffer();        for(int x=0;x<8;x++)        {            int temp=num&15;            if(temp>9)                //System.out.println((char)(temp-10+'A'));                sb.append((char)(temp-10+'A'));            else                //System.out.println(temp);                sb.append(temp);            num=num>>>4;        }        System.out.println(sb.reverse());    }}

用查表法完成进制转换

十进制转二进制,十六进制

public class findtable {    //查表法    public static void main(String[] args) {        tohex(60);        System.out.println("\n");        tobin(6);    }    public static void tobin(int num){        //定义一个二进制表        char[] chs={'0','1'};        //定义一个临时存储容器        char[] arr=new char[32];        //定义一个操作数组的指针        int pos= arr.length;         while(num!=0)         {             int temp=num&1;             arr[--pos]=chs[temp];             num=num>>>1;         }         for(int x=pos;x<arr.length;x++)         {             System.out.print(arr[x]);         }    }    public static void tohex(int num)    {        char[] chs={'0','1','2','3',                    '4','5','6','7',                    '8','9','A','B',                    'C','D','E','F'};        //定义一个临时容器        char[] arr=new char[8];        int pos=arr.length;        while(num!=0)        {            StringBuffer sb=new StringBuffer();            int temp=num&15;            //System.out.println(chs[temp]);            arr[--pos]=chs[temp];            num=num>>>4;        }        System.out.println("pos="+pos);        //存储数据的arr数组遍历        for(int x=pos;x<arr.length;x++)        {            System.out.print(arr[x]+",");        }    }}

[代码优化]十进制转二进制,八进制,十六进制

public class youhua {    public static void main(String[] args) {        tobin(6);        toox(60);        tohex(60);    }    //10-->2    public static void tobin(int num)    {        trans(num,1,1);        System.out.print("\n");    }    //10-->8    public static void toox(int num)    {        trans(num,7,3);        System.out.print("\n");    }    //10-->16    public static void tohex(int num)    {        trans(num,15,4);    }    public static void trans(int num,int base,int offset)    {        if(num==0)        {            System.out.println(0);            return ;        }        char[] chs={'0','1','2','3',                '4','5','6','7',                '8','9','A','B',                'C','D','E','F'};        char[] arr=new char[32];        int pos=arr.length;        while(num!=0)        {            int temp=num&base;            arr[--pos]=chs[temp];            num=num>>>offset;        }        for(int x=pos;x<arr.length;x++)        {            System.out.print(arr[x]);        }    }}

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