Collection of static methods for operations on arrays
//
// (C) Copyright 2009 Irantha Suwandarathna (irantha@gmail.com)
// All rights reserved.
//
/* Copyright (c) 2001-2008, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use _in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions _in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer _in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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*/
using System;
namespace EffiProz.Core.Lib
{
/**
* Collection of static methods for operations on arrays
*
* @author fredt@users
* @version 1.7.2
* @since 1.7.2
*/
public class ArrayUtil
{
public const int CLASS_CODE_BYTE = 'B';
public const int CLASS_CODE_CHAR = 'C';
public const int CLASS_CODE_DOUBLE = 'D';
public const int CLASS_CODE_FLOAT = 'F';
public const int CLASS_CODE_INT = 'I';
public const int CLASS_CODE_LONG = 'J';
public const int CLASS_CODE_OBJECT = 'L';
public const int CLASS_CODE_SHORT = 'S';
public const int CLASS_CODE_bool = 'Z';
//private static IntValueHashMap classCodeMap = new IntValueHashMap();
//static ArrayUtil()
//{
// classCodeMap.put(typeof(byte), ArrayUtil.CLASS_CODE_BYTE);
// classCodeMap.put(typeof(char), ArrayUtil.CLASS_CODE_SHORT);
// classCodeMap.put(typeof(short), ArrayUtil.CLASS_CODE_SHORT);
// classCodeMap.put(typeof(int), ArrayUtil.CLASS_CODE_INT);
// classCodeMap.put(typeof(long), ArrayUtil.CLASS_CODE_LONG);
// classCodeMap.put(typeof(float), ArrayUtil.CLASS_CODE_FLOAT);
// classCodeMap.put(typeof(double), ArrayUtil.CLASS_CODE_DOUBLE);
// classCodeMap.put(typeof(bool), ArrayUtil.CLASS_CODE_bool);
// classCodeMap.put(typeof(Object), ArrayUtil.CLASS_CODE_OBJECT);
//}
///**
// * Returns a distinct int code for each primitive type and for all Object types.
// */
//static int getClassCode(Type cla)
//{
// if (!cla.IsPrimitive)
// {
// return ArrayUtil.CLASS_CODE_OBJECT;
// }
// return classCodeMap.get(cla, -1);
//}
/**
* Returns true if arra and the first bcount elements of arrb share any
* element. <p>
*
* Used for checks for any overlap between two arrays of column indexes.
*/
public static bool haveCommonElement(int[] arra, int[] arrb,
int bcount)
{
for (int i = 0; i < arra.Length; i++)
{
int c = arra[i];
for (int j = 0; j < bcount; j++)
{
if (c == arrb[j])
{
return true;
}
}
}
return false;
}
public static bool areIntIndexesInBooleanArray(int[] arra,
bool[] arrb)
{
for (int i = 0; i < arra.Length; i++)
{
if (arrb[arra[i]])
{
continue;
}
return false;
}
return true;
}
/**
* Return count of true elements in array
*/
/**
* As above but copies in reverse direction. <p>
*
* @param row the target array
* @param columnMap the list of indexes into row
* @param newRow the source array
*/
public static void projectRowReverse(Object[] row, int[] columnMap,
Object[] newRow)
{
for (int i = 0; i < columnMap.Length; i++)
{
row[columnMap[i]] = newRow[i];
}
}
public static void orBooleanArray(bool[] source, bool[] dest)
{
for (int i = 0; i < dest.Length; i++)
{
dest[i] |= source[i];
}
}
/**
* Returns a duplicates of an array.
*/
public static Object duplicateArray(Object source) {
int size = ((Array)source).Length;
Array newarray =
Array.CreateInstance(source.GetType().GetElementType(), size);
Array.Copy((Array)source, 0, newarray, 0, size);
return newarray;
}
public static int countTrueElements(bool[] arra)
{
int count = 0;
for (int i = 0; i < arra.Length; i++)
{
if (arra[i])
{
count++;
}
}
return count;
}
public static int find(short[] array, int value)
{
for (int i = 0; i < array.Length; i++)
{
if (array[i] == value)
{
return i;
}
}
return -1;
}
public static int find(short[] array, int value, int offset, int count)
{
for (int i = offset; i < offset + count; i++)
{
if (array[i] == value)
{
return i;
}
}
return -1;
}
/**
* Finds the first element of the array that is not equal to the given value.
*/
public static int findNot(int[] array, int value)
{
for (int i = 0; i < array.Length; i++)
{
if (array[i] != value)
{
return i;
}
}
return -1;
}
/**
* Determines if the array has a null column for any of the positions given
* in the rowColMap array.
*/
public static bool hasNull(Object[] array, int[] columnMap)
{
int count = columnMap.Length;
for (int i = 0; i < count; i++)
{
if (array[columnMap[i]] == null)
{
return true;
}
}
return false;
}
public static bool hasAllNull(Object[] array, int[] columnMap)
{
int count = columnMap.Length;
for (int i = 0; i < count; i++)
{
if (array[columnMap[i]] != null)
{
return false;
}
}
return true;
}
/**
* Clears an area of the given array of the given type.
*/
public static void clearArray(int type, Object data, int from, int to)
{
switch (type)
{
case ArrayUtil.CLASS_CODE_BYTE:
{
byte[] array = (byte[])data;
while (--to >= from)
{
array[to] = 0;
}
return;
}
case ArrayUtil.CLASS_CODE_CHAR:
{
byte[] array = (byte[])data;
while (--to >= from)
{
array[to] = 0;
}
return;
}
case ArrayUtil.CLASS_CODE_SHORT:
{
short[] array = (short[])data;
while (--to >= from)
{
array[to] = 0;
}
return;
}
case ArrayUtil.CLASS_CODE_INT:
{
int[] array = (int[])data;
while (--to >= from)
{
array[to] = 0;
}
return;
}
case ArrayUtil.CLASS_CODE_LONG:
{
long[] array = (long[])data;
while (--to >= from)
{
array[to] = 0;
}
return;
}
case ArrayUtil.CLASS_CODE_FLOAT:
{
float[] array = (float[])data;
while (--to >= from)
{
array[to] = 0;
}
return;
}
case ArrayUtil.CLASS_CODE_DOUBLE:
{
double[] array = (double[])data;
while (--to >= from)
{
array[to] = 0;
}
return;
}
case ArrayUtil.CLASS_CODE_bool:
{
bool[] array = (bool[])data;
while (--to >= from)
{
array[to] = false;
}
return;
}
default:
{
Object[] array = (Object[])data;
while (--to >= from)
{
array[to] = null;
}
return;
}
}
}
/**
* Basic sort for small arrays of int.
*/
public static void sortArray(int[] array)
{
bool swapped;
do
{
swapped = false;
for (int i = 0; i < array.Length - 1; i++)
{
if (array[i] > array[i + 1])
{
int temp = array[i + 1];
array[i + 1] = array[i];
array[i] = temp;
swapped = true;
}
}
} while (swapped);
}
/**
* Basic find for small arrays of Object.
*/
public static int find(Object[] array, Object _object)
{
for (int i = 0; i < array.Length; i++)
{
if (array[i] == _object)
{
// hadles both nulls
return i;
}
if (_object != null && _object.Equals(array[i]))
{
return i;
}
}
return -1;
}
/**
* Returns the index of the first occurence of arrb in arra. Or -1 if not found.
*/
public static int find(byte[] arra, int start, int limit, byte[] arrb)
{
int k = start;
limit = limit - arrb.Length + 1;
int value = arrb[0];
for (; k < limit; k++)
{
if (arra[k] == value)
{
if (arrb.Length == 1)
{
return k;
}
if (containsAt(arra, k, arrb))
{
return k;
}
}
}
return -1;
}
/**
* Basic find for small arrays of int.
*/
public static int find(int[] array, int value)
{
for (int i = 0; i < array.Length; i++)
{
if (array[i] == value)
{
return i;
}
}
return -1;
}
/**
* Returns true if arra and arrb contain the same set of integers, not
* necessarily _in the same order. This implies the arrays are of the same
* length.
*/
public static bool areEqualSets(int[] arra, int[] arrb)
{
return arra.Length == arrb.Length
&& ArrayUtil.haveEqualSets(arra, arrb, arra.Length);
}
/**
* For full == true returns true if arra and arrb are identical (have the
* same length and contain the same integers _in the same sequence).
*
* For full == false returns the result
* of haveEqualArrays(arra,arrb,count)
*
* For full == true, the array lengths must be the same as count
*
*/
public static bool areEqual(int[] arra, int[] arrb, int count,
bool full)
{
if (ArrayUtil.haveEqualArrays(arra, arrb, count))
{
if (full)
{
return arra.Length == arrb.Length && count == arra.Length;
}
return true;
}
return false;
}
/**
* Returns true if the first count elements of arra and arrb are identical
* sets of integers (not necessarily _in the same order).
*
*/
public static bool haveEqualSets(int[] arra, int[] arrb, int count)
{
if (count > arra.Length || count > arrb.Length)
{
return false;
}
if (count == 1)
{
return arra[0] == arrb[0];
}
int[] tempa = (int[])resizeArray(arra, count);
int[] tempb = (int[])resizeArray(arrb, count);
sortArray(tempa);
sortArray(tempb);
for (int j = 0; j < count; j++)
{
if (tempa[j] != tempb[j])
{
return false;
}
}
return true;
}
/**
* Returns true if the first count elements of arra and arrb are identical
* subarrays of integers
*
*/
public static bool haveEqualArrays(int[] arra, int[] arrb, int count)
{
if (count > arra.Length || count > arrb.Length)
{
return false;
}
for (int j = 0; j < count; j++)
{
if (arra[j] != arrb[j])
{
return false;
}
}
return true;
}
/**
* Returns an int[] containing elements shared between the two arrays
* arra and arrb. The arrays contain sets (no value is repeated).
*
* Used to find the overlap between two arrays of column indexes.
* Ordering of the result arrays will be the same as _in array
* a. The method assumes that each index is only listed
* once _in the two input arrays.
* <p>
* e.g.
* </p>
* <code>
* <table width="90%" bgcolor="lightblue">
* <tr><td colspane="3">The arrays</td></tr>
* <tr><td>int []arra</td><td>=</td><td>{2,11,5,8}</td></tr>
* <tr><td>int []arrb</td><td>=</td><td>{20,8,10,11,28,12}</td></tr>
* <tr><td colspane="3">will result in:</td></tr>
* <tr><td>int []arrc</td><td>=</td><td>{11,8}</td></tr>
* </table>
*
* @param arra int[]; first column indexes
*
* @param arrb int[]; second column indexes
*
* @return int[] common indexes or <code>null</code> if there is no overlap.
*
* @short Return the overlap between two arrays of column indexes.
*/
public static int[] commonElements(int[] arra, int[] arrb)
{
int[] c = null;
int n = countCommonElements(arra, arrb);
if (n > 0)
{
c = new int[n];
int k = 0;
for (int i = 0; i < arra.Length; i++)
{
for (int j = 0; j < arrb.Length; j++)
{
if (arra[i] == arrb[j])
{
c[k++] = arra[i];
}
}
}
}
return c;
}
/**
* Returns the number of elements shared between the two arrays containing
* sets.<p>
*
* Return the number of elements shared by two column index arrays.
* This method assumes that each of these arrays contains a set (each
* element index is listed only once _in each index array). Otherwise the
* returned number will NOT represent the number of unique column indexes
* shared by both index array.
*
* @param arra int[]; first array of column indexes.
*
* @param arrb int[]; second array of column indexes
*
* @return int; number of elements shared by <code>a</code> and <code>b</code>
*/
public static int countCommonElements(int[] arra, int[] arrb)
{
int k = 0;
for (int i = 0; i < arra.Length; i++)
{
for (int j = 0; j < arrb.Length; j++)
{
if (arra[i] == arrb[j])
{
k++;
}
}
}
return k;
}
/**
* Returns the count of elements _in arra from position start that are
* sequentially equal to the elements of arrb.
*/
public static int countSameElements(byte[] arra, int start, byte[] arrb)
{
int k = 0;
int limit = arra.Length - start;
if (limit > arrb.Length)
{
limit = arrb.Length;
}
for (int i = 0; i < limit; i++)
{
if (arra[i + start] == arrb[i])
{
k++;
}
else
{
break;
}
}
return k;
}
/**
* Returns the count of elements in arra from position start that are
* among the elements of arrb. Stops at any element not in arrb.
*/
public static int countStartElementsAt(byte[] arra, int start,
byte[] arrb)
{
int k = 0;
for (int i = start; i < arra.Length; i++)
{
for (int j = 0; j < arrb.Length; j++)
{
if (arra[i] == arrb[j])
{
k++;
goto mainloop;
}
}
break;
mainloop:
continue;
}
return k;
}
/**
* Returns the count of elements in arra from position start that are not
* among the elements of arrb.
*
*/
public static int countNonStartElementsAt(byte[] arra, int start,
byte[] arrb)
{
int k = 0;
for (int i = start; i < arra.Length; i++)
{
for (int j = 0; j < arrb.Length; j++)
{
if (arra[i] == arrb[j])
{
goto outmainloop;
}
}
k++;
}
outmainloop:
return k;
}
///**
// * Returns the index of the first occurence of arrb _in arra. Or -1 if not found.
// */
//public static int find(byte[] arra, int start, int limit, byte[] arrb)
//{
// int k = 0;
// limit = limit - arrb.Length + 1;
// int value = arrb[0];
// for (; k < limit; k++)
// {
// if (arra[k] == value)
// {
// if (arrb.Length == 1)
// {
// return k;
// }
// if (containsAt(arra, k, arrb))
// {
// return k;
// }
// }
// }
// return -1;
//}
///**
// * Returns an index into arra (or -1) where the character is not _in the
// * charset byte array.
// */
//public static int findNotIn(byte[] arra, int start, int limit,
// byte[] charset)
//{
// int k = 0;
// for (; k < limit; k++)
// {
// for (int i = 0; i < charset.Length; i++)
// {
// if (arra[k] == charset[i])
// {
// continue;
// }
// }
// return k;
// }
// return -1;
//}
///**
// * Returns an index into arra (or -1) where the character is _in the
// * charset byte array.
// */
//public static int findIn(byte[] arra, int start, int limit,
// byte[] charset)
//{
// int k = 0;
// for (; k < limit; k++)
// {
// for (int i = 0; i < charset.Length; i++)
// {
// if (arra[k] == charset[i])
// {
// return k;
// }
// }
// }
// return -1;
//}
///**
// * Returns the index of b or c _in arra. Or -1 if not found.
// */
//public static int find(byte[] arra, int start, int limit, int b, int c)
//{
// int k = 0;
// for (; k < limit; k++)
// {
// if (arra[k] == b || arra[k] == c)
// {
// return k;
// }
// }
// return -1;
//}
/**
* Set elements of arrb true if their indexes appear _in arrb.
*/
public static void intIndexesToboolArray(int[] arra, bool[] arrb)
{
for (int i = 0; i < arra.Length; i++)
{
if (arra[i] < arrb.Length)
{
arrb[arra[i]] = true;
}
}
}
/**
* Return true if for each true element _in arrb, the corresponding
* element _in arra is true
*/
public static bool containsAllTrueElements(bool[] arra,
bool[] arrb)
{
for (int i = 0; i < arra.Length; i++)
{
if (arrb[i] && !arra[i])
{
return false;
}
}
return true;
}
/**
* Returns true if arra from position start contains all elements of arrb
* _in sequential order.
*/
public static bool containsAt(byte[] arra, int start, byte[] arrb)
{
return countSameElements(arra, start, arrb) == arrb.Length;
}
///**
// * Returns the count of elements _in arra from position start that are
// * among the elements of arrb. Stops at any element not _in arrb.
// */
//public static int countStartElementsAt(byte[] arra, int start,
// byte[] arrb)
//{
// int k = 0;
// for (int i = start; i < arra.Length; i++)
// {
// for (int j = 0; j < arrb.Length; j++)
// {
// if (arra[i] == arrb[j])
// {
// k++;
// goto mainloop;
// }
// }
// break;
// mainloop: { }
// }
// return k;
//}
///**
// * Returns the count of elements _in arra from position start that are not
// * among the elements of arrb.
// *
// */
//public static int countNonStartElementsAt(byte[] arra, int start,
// byte[] arrb)
//{
// int k = 0;
// for (int i = start; i < arra.Length; i++)
// {
// for (int j = 0; j < arrb.Length; j++)
// {
// if (arra[i] == arrb[j])
// {
// goto mainloop;
// }
// }
// k++;
// }
//mainloop: { }
// return k;
//}
///**
// * Convenience wrapper for Array.Copy().
// */
//public static void copyArray(Object source, Object dest, int count)
//{
// Array.Copy((Array)source, 0, (Array)dest, 0, count);
//}
/**
* Returns a range of elements of source from start to end of the array.
*/
public static int[] arraySlice(int[] source, int start, int count)
{
int[] slice = new int[count];
Array.Copy(source, start, slice, 0, count);
return slice;
}
/**
* Fills the array with a value.
*/
public static void fillArray(Object[] array, Object value)
{
int to = array.Length;
while (--to >= 0)
{
array[to] = value;
}
}
/**
* Fills part of the array with a value.
*/
public static void fillArray(char[] array, int offset, char value)
{
int to = array.Length;
while (--to >= offset)
{
array[to] = value;
}
}
/**
* Fills the int array with a value
*/
public static void fillArray(int[] array, int value)
{
int to = array.Length;
while (--to >= 0)
{
array[to] = value;
}
}
///**
// * Returns a duplicates of an array.
// */
//public static Object duplicateArray(Object source)
//{
// int size = ((Array)source).Length;
// Object newarray =
// Array.CreateInstance(source.GetType(), size);
// Array.Copy((Array)source, 0, (Array)newarray, 0, size);
// return newarray;
//}
/**
* Returns the given array if newsize is the same as existing.
* Returns a new array of given size, containing as many elements of
* the original array as it can hold.
*/
public static Object resizeArrayIfDifferent(Object source, int newsize)
{
int oldsize = ((Array)source).Length;
if (oldsize == newsize)
{
return source;
}
Object newarray =
Array.CreateInstance(source.GetType().GetElementType(), newsize);
if (oldsize < newsize)
{
newsize = oldsize;
}
Array.Copy((Array)source, 0, (Array)newarray, 0, newsize);
return newarray;
}
/**
* Returns a new array of given size, containing as many elements of
* the original array as it can hold. N.B. Always returns a new array
* even if newsize parameter is the same as the old size.
*/
public static Object resizeArray(Object source, int newsize)
{
Object newarray =
Array.CreateInstance(source.GetType().GetElementType(), newsize);
int oldsize = ((Array)source).Length;
if (oldsize < newsize)
{
newsize = oldsize;
}
Array.Copy((Array)source, 0, (Array)newarray, 0, newsize);
return newarray;
}
/**
* Returns an array containing the elements of parameter source, with one
* element removed or added. Parameter adjust {-1, +1} indicates the
* operation. Parameter colindex indicates the position at which an element
* is removed or added. Parameter addition is an Object to add when
* adjust is +1.
*/
public static Object toAdjustedArray(Array source, Object addition,
int colindex, int adjust)
{
int newsize = ((Array)source).Length + adjust;
Object newarray =
Array.CreateInstance(source.GetType().GetElementType(), newsize);
copyAdjustArray(source, newarray, addition, colindex, adjust);
return newarray;
}
/**
* Copies elements of source to dest. If adjust is -1 the element at
* colindex is not copied. If adjust is +1 that element is filled with
* the Object addition. All the rest of the elements _in source are
* shifted left or right accordingly when they are copied. If adjust is 0
* the addition is copied over the element at colindex.
*
* No checks are perfomed on array sizes and an exception is thrown
* if they are not consistent with the other arguments.
*/
public static void copyAdjustArray(Object source, Object dest,
Object addition, int colindex,
int adjust)
{
int length = ((Array)source).Length;
if (colindex < 0)
{
Array.Copy((Array)source, 0, (Array)dest, 0, length);
return;
}
Array.Copy((Array)source, 0, (Array)dest, 0, colindex);
if (adjust == 0)
{
int endcount = length - colindex - 1;
((Array)dest).SetValue(addition, colindex);
if (endcount > 0)
{
Array.Copy((Array)source, colindex + 1, (Array)dest, colindex + 1,
endcount);
}
}
else if (adjust < 0)
{
int endcount = length - colindex - 1;
if (endcount > 0)
{
Array.Copy((Array)source, colindex + 1, (Array)dest, colindex,
endcount);
}
}
else
{
int endcount = length - colindex;
((Array)dest).SetValue(addition, colindex);
if (endcount > 0)
{
Array.Copy((Array)source, colindex, (Array)dest, colindex + 1,
endcount);
}
}
}
/**
* Returns a new array with the elements _in collar adjusted to reflect
* changes at colindex. <p>
*
* Each element _in collarr represents an index into another array
* otherarr. <p>
*
* colindex is the index at which an element is added or removed.
* Each element _in the result array represents the new,
* adjusted index. <p>
*
* For each element of collarr that represents an index equal to
* colindex and adjust is -1, the result will not contain that element
* and will be shorter than collar by one element.
*
* @param colarr the source array
* @param colindex index at which to perform adjustement
* @param adjust +1, 0 or -1
* @return new, adjusted array
*/
public static int[] toAdjustedColumnArray(int[] colarr, int colindex,
int adjust)
{
if (colarr == null)
{
return null;
}
int[] intarr = new int[colarr.Length];
int j = 0;
for (int i = 0; i < colarr.Length; i++)
{
if (colarr[i] > colindex)
{
intarr[j] = colarr[i] + adjust;
j++;
}
else if (colarr[i] == colindex)
{
if (adjust < 0)
{
// skip an element from colarr
}
else
{
intarr[j] = colarr[i] + adjust;
j++;
}
}
else
{
intarr[j] = colarr[i];
j++;
}
}
if (colarr.Length != j)
{
int[] newarr = new int[j];
Array.Copy(intarr, newarr, j);
return newarr;
}
return intarr;
}
/**
* Copies some elements of row into colobject by using colindex as
* the list of indexes into row. <p>
*
* colindex and colobject are of equal length and are normally
* shorter than row. <p>
*
* @param row the source array
* @param colindex the list of indexes into row
* @param colobject the destination array
*/
public static void copyColumnValues(Object[] row, int[] colindex,
Object[] colobject)
{
for (int i = 0; i < colindex.Length; i++)
{
colobject[i] = row[colindex[i]];
}
}
public static void copyColumnValues(int[] row, int[] colindex,
int[] colobject)
{
for (int i = 0; i < colindex.Length; i++)
{
colobject[i] = row[colindex[i]];
}
}
public static void fillSequence(int[] colindex)
{
for (int i = 0; i < colindex.Length; i++)
{
colindex[i] = i;
}
}
/**
* Copies some elements of row into newRow by using columnMap as
* the list of indexes into row. <p>
*
* columnMap and newRow are of equal length and are normally
* shorter than row. <p>
*
* @param row the source array
* @param columnMap the list of indexes into row
* @param newRow the destination array
*/
public static void projectRow(Object[] row, int[] columnMap,
Object[] newRow)
{
for (int i = 0; i < columnMap.Length; i++)
{
newRow[i] = row[columnMap[i]];
}
}
public static void projectRow(int[] row, int[] columnMap, int[] newRow)
{
for (int i = 0; i < columnMap.Length; i++)
{
newRow[i] = row[columnMap[i]];
}
}
/*
public static void main(String[] args) {
int[] a = new int[] {
23, 11, 37, 7, 1, 5
};
int[] b = new int[] {
1, 3, 7, 11, 13, 17, 19, 3, 1
};
int[] c = toAdjustedColumnArray(a, 7, -1);
int[] d = toAdjustedColumnArray(b, 11, 1);
int[] e = new int[a.Length];
copyArray(a, e, a.Length);
sortArray(e);
int[] f = new int[b.Length];
copyArray(b, f, b.Length);
sortArray(f);
bool x = haveEqualSets(a, e, a.Length);
bool y = haveEqualSets(b, f, b.Length);
Console.Write("test passed: ");
Console.Write(x == true && y == true && c.Length == a.Length - 1
&& d.Length == b.Length);
}
*/
}
}
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