減法字串處理

package cc.openhome;
import java.math.BigDecimal;
import java.util.Scanner;
public class main {
    public static void main(String[] args) {
      Scanner com=new Scanner(System.in);
      System.out.printf("減法運算\n");
      //字串處理運算宣告(可運算數值擴大且為精確運算
       BigDecimal []op;
       op=new BigDecimal[5];

      System.out.printf("請輸入數字a:");
      op[0]=new BigDecimal(com.next());
      System.out.printf("請輸入數字b:");
      op[1]=new BigDecimal(com.next());
      System.out.printf(" a-b= %.2f\n",op[0].subtract(op[1]));
    }
}