技術標籤：題解

進位制轉換

• 10進位制轉b進位制
• b進位制轉10進位制

10進位制轉b進位制

短除法

 public static String convertToB(int x,int b){
        StringBuffer sb = new StringBuffer();
        while(x>0){
         int mod = x%b;
          x/=b;
          sb.append(get(mod));
        }
        sb.reverse();
        return sb.toString
 
();
    }
  public static char get(int x){
       if(x<=9){
          return (char) (x+'0');
       }else{
          return (char)(x+'A'-10);
       }
    }
      public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int b  = in.nextInt();
        int x = in.
 
nextInt();
        System.out.println(convertToB(x,b));
    }

b進位制轉10進位制

秦九昭演算法

 static int convertTo10(String str,int b){
  int ret =0;
  for(int i = 0;i<str.length();i++){
       ret = ret * b +getInt(str.charAt(i));
     }
     return ret;
    }
  static int getInt(char a) {
     if(a>='0'&&
 
a<='9'){
         return a-'0';
      }else{
        return a-'A'+10;
     }
  }
   public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int b = in.nextInt();
        int x = in.nextInt();
        System.out.println(convertToB(x, b));
        System.out.println(convertTo10(convertToB(x,b),b));
    }