我需要製作一個程序,不使用biginteger類就可以添加長整數。方法中的錯誤返回類型
我現在正在研究add
方法,我認爲我的方法正確,但我堅持爲我的方法返回正確的數據類型,我不確定如何更正它。
這裏是我的2班至今:
主類:
import java.util.Scanner;
public class testLargeInteger
{
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
String string1;
String string2;
int exp =0;
System.out.print("Enter the first integer: ");
//Store up the input string 「string1」 entered by the user from the keyboard.
string1 = input.next();
LargeInteger firstInt = new LargeInteger(string1);
System.out.print("Enter the second integer: ");
string2 = input.next();
//Store up the input string 「string2」 entered by the user from the keyboard.
LargeInteger secondInt = new LargeInteger(string2);
System.out.print("Enter the exponential integer: ");
//Store up the input integer 「exp」 entered by the user from the keyboard.
exp = input.nextInt();
LargeInteger sum = firstInt.add(secondInt);
System.out.printf ("First integer: %s \n", firstInt.display());
System.out.println("Second integer: " + secondInt.display());
System.out.println(" Exponent: " + exp);
System.out.printf (" Sum = %s \n", sum.display());
}
}
LargeInteger.class:
public class LargeInteger
{
private int[] intArray;
//convert the strings to array
public LargeInteger(String s)
{
intArray = new int[s.length()];
for (int i = 0; i < s.length(); i++)
intArray[i] = Character.digit(s.charAt(i), 10); // in base 10
}
//display the strings
public String display()
{
String result="";
for (int i = 0; i < intArray.length; i++)
result += intArray[i];
return result.toString();
}
//get first array
public int[] getIntArray()
{
return intArray;
}
public LargeInteger add(LargeInteger secondInt)
{
int[] otherValues = secondInt.getIntArray();
int maxIterations = Math.min(intArray.length, otherValues.length);
int currentResult; //to store result
int[] resultArray = new int[Math.max(intArray.length, otherValues.length) + 1];
int needToAdd = 0; //to store result should be added next step
for(int i = 0; i < maxIterations; i++)
{
currentResult = intArray[i] + otherValues[i];
resultArray[i] = currentResult % 10 + needToAdd; //if more than 9 its correct answer
needToAdd = currentResult/10; //this is what you need to add on next step
}
resultArray[Math.max(intArray.length, otherValues.length) + 1] = needToAdd;
return resultArray;
}
}
謝謝你的作品。現在我需要看到什麼毛病我陣列..得到一個「ArrayIndexOutOfBoundsException」錯誤。 – Sackling 2012-03-24 22:44:05