用Java编写的数制转换

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package d2; import java.util.*; /** * * @author Gexiuhua And Caixia */ class Binery { String bi; Binery() { } public long oRder(int x)//2的x次方求解 { long sum=1; for(int i=x-1;i>=0;i--) { sum*=2; } return sum; } public String bToOctal(String x)//二进制转换成八进制 { for(int i=0;i<x.length();i++) { if(x.charAt(i)!='1'&&x.charAt(i)!='0') System.out.println("The number is not binery."); } if(x.length()%3==1) { x=(new StringBuffer("00").append(x).toString()); } else if(x.length()%3==2) { x=(new StringBuffer("0").append(x).toString()); } String []str=new String[x.length()/3]; int j=0; for(int i=0;i<x.length();i+=3) { str[j]=x.substring(i,i+3); j++; } StringBuffer ss=new StringBuffer(""); for(int i=0;i<str.length;i++) { ss=(ss.append(bToTen(str[i]))); } return ss.toString(); } public String bToHex(String x)//二进制转换成十六进制 { for(int i=0;i<x.length();i++) { if(x.charAt(i)!='1'&&x.charAt(i)!='0') System.out.println("The number is not binery."); } if(x.length()%4==1) { x=(new StringBuffer("000").append(x).toString()); } else if(x.length()%4==2) { x=(new StringBuffer("00").append(x).toString()); } else if(x.length()%4==3) { x=(new StringBuffer("0").append(x).toString()); } String []str=new String[x.length()/4]; int j=0; for(int i=0;i<x.length();i+=4) { str[j]=x.substring(i,i+4); j++; } StringBuffer ss=new StringBuffer(""); for(int i=0;i<str.length;i++) { if(bToTen(str[i])==10) { str[i]="A"; } else if(bToTen(str[i])==11) { str[i]="B"; } else if(bToTen(str[i])==12) { str[i]="C"; } else if(bToTen(str[i])==14) { str[i]="D"; } else{str[i]="E";} ss=(ss.append(str[i])); } return ss.toString(); } public String tenToBinery(long x)//十进制转换成二进制 { StringBuffer ss=new StringBuffer(); while(x!=0) { ss=ss.append(x%2); x/=2; } String b=ss.reverse().toString(); return b; } public int bToTen(String x)//二进制转换成十进制 { int sum=0; for(int i=0;i<x.length();i++) { if(x.charAt(i)!='1'&&x.charAt(i)!='0') { System.out.println("The number is not binery."); break; } else{ for(int j=x.length();j>=1;j--) { sum +=oRder(j-1)*(int)(((x.charAt(x.length()-j)-'0'))); } return sum; } } } } public class Main { public static void main(String[] args) { Binery b=new Binery(); System.out.println("Do you want to know what?\n\n1.二进制转换成八进制:\n\n2.二进制转换成十进制:\n"); System.out.println("3.二进制转换成十六进制\n\n4.十进制转换成二进制:\n"); Scanner sc=new Scanner(System.in); int s=sc.nextInt(); switch(s) { case 1: System.out.println("please input the binery1 :"); Scanner sc1=new Scanner(System.in); String s1=sc1.nextLine(); System.out.println( b.bToOctal(s1)); break; case 2: System.out.println("please input the binery2 :"); Scanner sc2=new Scanner(System.in); String s2=sc2.nextLine(); System.out.println(b.bToTen(s2 )); break; case 3: System.out.println("please input the binery3 :"); Scanner sc3=new Scanner(System.in); String s3=sc3.nextLine(); System.out.println(b.bToHex(s3)); break; case 4: System.out.println("please input the ten number: "); long s4=sc.nextLong(); System.out.println(b.tenToBinery(s4)); break; default: System.out.println("Input wrong !"); break; } System.out.println("please input the first binery:"); Scanner sc1=new Scanner(System.in); String s1=sc1.nextLine(); System.out.println("please input the second binery:"); Scanner sc2=new Scanner(System.in); String s2=sc2.nextLine(); System.out.println("please input the operator(+,-,*)"); System.out.println("1.Plus(+)\n2.Subtraction(-):\n3.Multiplication:(*)"); Scanner sc3=new Scanner(System.in); int x=sc3.nextInt(); switch(x) { case 1: System.out.println(s1+" + "+s2+" = "+b.tenToBinery((b.bToTen(s1)+b.bToTen(s2)))); break; case 2: System.out.println(s1+" - "+s2+" = "+b.tenToBinery((b.bToTen(s1)-b.bToTen(s2)))); break; case 3: System.out.println(s1+" * "+s2+" = "+b.tenToBinery((b.bToTen(s1)*b.bToTen(s2)))); break; default: System.out.println("Input wrong !"); break; // Binery bb=new Binery(); // String ss=sc.nextLine(); // System.out.println(bb.bToHex(ss)); } } }