題目概要：
10進位轉16進位，16進位轉10進位。
解題方向：
使用計概所教的方法去實作。
程式碼：
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| //Java | |
| import java.util.Scanner; | |
| class uva10473{ | |
| public static void main(String args[]){ | |
| Scanner sc=new Scanner(System.in); | |
| while(sc.hasNext()){ | |
| String s=sc.next(); | |
| if(s.charAt(0)=='-') break; | |
| if(s.charAt(0)=='0'){ | |
| System.out.println(HTob10(s)); | |
| }else{ | |
| System.out.println(b10ToH(s)); | |
| } | |
| } | |
| } | |
| //16進位轉→10進位 | |
| public static int HTob10(String st){ | |
| int ans=0; | |
| for(int i=st.length()-1;i>1;i--){ | |
| int temp=st.charAt(i); | |
| if(temp>=65) temp=temp-55; //temp-65+10 | |
| else temp=temp-48; | |
| ans=ans+(int)(temp*Math.pow(16,st.length()-i-1)); | |
| } | |
| return ans; | |
| } | |
| //10進位轉→16進位 | |
| public static String b10ToH(String st){ | |
| String ans=""; | |
| int temp=Integer.parseInt(st); | |
| while(temp>0){ | |
| int c=temp%16; | |
| if(c>=10) ans=(char)(65+c%10)+ans; | |
| else ans=c+ans; | |
| temp=temp/16; | |
| } | |
| ans="0x"+ans; | |
| return ans; | |
| } | |
| } |
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