myBigInteger

Class SignedAddSubInt

java.lang.Object

myBigInteger.AdditionOnlyInt

myBigInteger.AddSubInt

myBigInteger.SignedAddSubInt

All Implemented Interfaces:

java.lang.Comparable<BigInt>, BigInt

public class SignedAddSubInt
extends AddSubInt

This BigIng extends AddSubInt with sign supported.

Author:

Chung-Chih Li

Constructor Summary

Constructors

Constructor and Description
SignedAddSubInt()
SignedAddSubInt(SignedAddSubInt a) Copy constructor; a deep copy should be performed.
SignedAddSubInt(java.lang.String a) This is a constructor that construct an AddSubInt with value presented by the input string.

Method Summary

Modifier and Type	Method and Description
void	add(BigInt b) Add an SignedAddSubInt mx into this BigInt.
static SignedAddSubInt	add(SignedAddSubInt a, SignedAddSubInt b) The method should not have side-effect.
int	compareTo(BigInt b) Override the default compareTo method
void	subtract(BigInt b) Students don't have to implement this method for Asg3.
static SignedAddSubInt	subtract(SignedAddSubInt a, SignedAddSubInt b)
java.lang.String	toString() Override the default toString method
java.lang.String	toString(int w)

Methods inherited from class myBigInteger.AddSubInt

add, subtract

Methods inherited from class myBigInteger.AdditionOnlyInt

add, div, equals, times

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SignedAddSubInt

public SignedAddSubInt()

SignedAddSubInt

public SignedAddSubInt(java.lang.String a)

This is a constructor that construct an AddSubInt with value presented by the input string. For example, if input a = "000123400", this constructor will set the byte array to have value {0,0,4,3,2,1}. Note that the leading zeros in the input string should not be stored.

Parameters:

a - is a string such as "000123400"

SignedAddSubInt

public SignedAddSubInt(SignedAddSubInt a)

Copy constructor; a deep copy should be performed.

Parameters:

a - to be copied

Method Detail

add

public static SignedAddSubInt add(SignedAddSubInt a,
                                  SignedAddSubInt b)

The method should not have side-effect. I.e., the contents of this, a and b should not be modified.

Parameters:

a - is AddSubInt

b - is AddSubInt

Returns:

the result of a+b in an AddSubInt

subtract

public static SignedAddSubInt subtract(SignedAddSubInt a,
                                       SignedAddSubInt b)

add

public void add(BigInt b)

Add an SignedAddSubInt mx into this BigInt.

Specified by:

add in interface BigInt

Overrides:

add in class AdditionOnlyInt

Parameters:

b - is a BigInt, some type casting is necessary

subtract

public void subtract(BigInt b)

Description copied from class: AdditionOnlyInt

Students don't have to implement this method for Asg3. Just make an empty function body.

Specified by:

subtract in interface BigInt

Overrides:

subtract in class AddSubInt

Parameters:

b - to be substracted

compareTo

public int compareTo(BigInt b)

Override the default compareTo method

Specified by:

compareTo in interface java.lang.Comparable<BigInt>

Overrides:

compareTo in class AdditionOnlyInt

Parameters:

b - is expected to be a BigInt to work correctly

Returns:

0 if equal, -1 if this BigInt is less than x, and +1 if this BigInt is greater than x

toString

public java.lang.String toString()

Description copied from class: AdditionOnlyInt

Override the default toString method

Overrides:

toString in class AdditionOnlyInt

Returns:

this BigInt in a string, e.g., "123456789100".

toString

public java.lang.String toString(int w)

Parameters:

w - is the length of the returned string using right alignment

Returns:

a String of length n using right alignment; if n is too small, it will be ignored