5、进制转换

//二进制public static void toBin(int num){trans(num,1,1);}//八进制public static void toBa(int num){trans(num,7,3);}//十六进制public static void toHex(int num){trans(num,15,4);}//base&的基数,off偏移量public static void trans(int num,int base,int off){if(num==0){System.out.println(0);return;}char[] arr={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};char[] ch=new char[32];int pos=ch.length;while(num!=0){int n=num&base;ch[--pos]=arr[n];num=num>>>off;}for(int x=pos;pos<ch.length;pos++){System.out.print(ch[pos]);}}

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