public void TestAddNumbersOfSameLength()
{
var val1 = new StringNumber ("123");
var val2 = new StringNumber ("987");
var retval = StringNumberAdder.add (val1, val2);
Assert.AreEqual ("1110", retval.Value);
}
public void TestAddSecondNumberIsLonger()
{
var val1 = new StringNumber ("123");
var val2 = new StringNumber ("12345567");
var retval = StringNumberAdder.add (val1, val2);
Assert.IsNotNull (retval);
Assert.AreEqual ("12345690", retval.Value);
}
public void TestAddFirstNumberIsLonger()
{
var val1 = new StringNumber ("987654321");
var val2 = new StringNumber ("1234");
var retval = StringNumberAdder.add (val1, val2);
Assert.IsNotNull (retval);
Assert.AreEqual ("987655555", retval.Value);
}
public static StringNumber subtract(StringNumber first, StringNumber second)
{
StringNumber minuend;
StringNumber subtrahend;
bool sign_flip = false;
// Padd them out
if (first.Value.Length > second.Value.Length) {
second = new StringNumber (second.Value.PadLeft (first.Value.Length, '0'));
minuend = first;
subtrahend = second;
}
else if (second.Value.Length > first.Value.Length)
{
first = new StringNumber(first.Value.PadLeft(second.Value.Length, '0'));
minuend = second;
subtrahend = first;
}
else // same length
{
if (String.Compare(first.Value, second.Value) > 0) {
minuend = first;
subtrahend = second;
} else {
minuend = second;
subtrahend = first;
}
}
bool addOneToNext = false;
StringBuilder sb = new StringBuilder();
for(int i = minuend.Value.Length-1; i >= 0; i--) {
int m = Int32.Parse(minuend.Value[i].ToString());
int s = Int32.Parse(subtrahend.Value[i].ToString());
if (addOneToNext) {
s += 1;
}
if (s > m) {
addOneToNext = true;
sb.Append(m+10-s);
} else {
addOneToNext = false;
sb.Append(m-s);
}
}
char[] chars = sb.ToString().ToCharArray();
Array.Reverse(chars);
return new StringNumber(new String(chars));
}
public static StringNumber add(StringNumber first, StringNumber second)
{
StringNumber temp_first;
StringNumber temp_second;
if (first.Value.Length > second.Value.Length) {
temp_first = first;
temp_second = new StringNumber (second.Value.PadLeft (first.Value.Length, '0'));
}
else
{
temp_first = new StringNumber(first.Value.PadLeft(second.Value.Length, '0'));
temp_second = second;
}
UInt32 carry = 0;
var sb = new StringBuilder ();
for (int i = temp_first.Value.Length-1; i >= 0; i--)
{
char elem1 = temp_first.Value [i];
char elem2 = temp_second.Value [i];
var val1 = UInt32.Parse (elem1.ToString());
var val2 = UInt32.Parse (elem2.ToString());
UInt32 total = val1 + val2 + carry;
carry = total / 10;
sb.Append ((total % 10).ToString ());
}
if (carry > 0) {
sb.Append (carry.ToString ());
}
// This is f****d up if this is actually the state of the art for reversing strings
// in C#. WTF?!?!?!
char[] arr = sb.ToString().ToCharArray();
Array.Reverse(arr);
var value = new String(arr);
return new StringNumber(value);
}
public void TestEqualsMethodNotEqualObjects()
{
var val1 = new StringNumber ("123");
Assert.IsFalse (val1.Equals (new StringNumber ("456")));
}
public void TestEqualsMethodEqualObject()
{
var val1 = new StringNumber ("123");
Assert.IsTrue (val1.Equals (new StringNumber ("123")));
}
public void TestEqualsMethodDifferentObjects()
{
var val1 = new StringNumber ("123");
Assert.IsFalse (val1.Equals ("123"));
}
public void BasicInstantiation()
{
var testval = new StringNumber ("123");
Assert.AreEqual ("123", testval.Value);
}
public void TestSubtraction()
{
var val1 = new StringNumber ("456");
var val2 = new StringNumber ("123");
var retval = StringNumberSubtracter.subtract (val1, val2);
Assert.AreEqual ("333", retval.Value);
}
public void TestOverloadedNotEqualsOperatorSame()
{
var val1 = new StringNumber ("123");
var val2 = new StringNumber ("123");
Assert.IsFalse (val1 != val2);
}
public void TestOverloadedAddOperator()
{
var val1 = new StringNumber ("123");
var val2 = new StringNumber ("987");
Assert.AreEqual ("1110", (val1 + val2).Value);
}
