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By : user2950408
Date : November 17 2020, 11:55 AM
seems to work fine Short answer: Your code is wrong for the case when s1[i] == s2[i] and carry == 1.
Longer answer: You should restructure your code to have three separate cases for s==-1, s==0, and s==1, and then branch on the value of carry within each case: code :
``````if s == -1:  # 0-1
if carry == 0:
...
else:
...
elif s == 0:  # 1-1 or 0-0
if carry == 0:
...
else:
...
else:  # 1-0
if carry == 0:
...
else:
...
`````` ## Fortran: Binary Subtraction (is there a binary type?)

By : user2113401
Date : March 29 2020, 07:55 AM
around this issue You need to be a bit clearer about what you mean by 'binary numbers in fortran'. In one sense, not terribly useful, all Fortran numbers are binary, as indeed most numbers in most programming languages are binary once they get onto the computer.
Fortran, in the standard at least, does not have the concept of a binary intrinsic data type, it has integers, reals, complex numbers, logicals and characters. Of course, your compiler might implement other types as well, but you don't tell us what that compiler is. ## Binary subtraction

By : Ala'a walid
Date : March 29 2020, 07:55 AM
I hope this helps . Take the two's complement of the subtrahend and add it to the minuend.
code :
``````  0000 0000
- 1111 1111

...

0000 0000
+ 0000 0001
-----------
0000 0001
`````` ## Binary subtraction in Java

By : J.Wen
Date : March 29 2020, 07:55 AM
I wish this helpful for you You can do it strictly bitwise, right to left, like at least some chips do. The tricky knowledge is a five-column table: (a,b, carry bit from prior position) -> (result, new carry bit). You don't actually borrow from the higher-level positions; you carry the underverflow into those instead. See table 2.4 here: ## Binary Subtraction with 2's Complement

By : Deepul Bharti
Date : March 29 2020, 07:55 AM
Does that help I need help subtracting with binary using 2's representation and using 5 bits for each number: , 1) -9 - 7
-9 - 7 = -9 + -7
code :
`````` 10111 +
11001 =
110000
``````
`````` 00110 +
10110 =
11100
`````` ## Binary Subtraction VB.NET

By : user1847626
Date : March 29 2020, 07:55 AM
will be helpful for those in need If you really want the output to be -01111 (or -1111, since the leading zero is omitted) you have to make the number positive and then prepend the binary string with the minus sign.
Then, when converting it back you have to remove the sign and make the resulting number negative again.
code :
``````Dim BinaryResult As Integer = Convert.ToInt32(TextBox1.Text, 2) - Convert.ToInt32(TextBox2.Text, 2)

If BinaryResult < 0 Then
TextBox3.Text = "-" & Convert.ToString(-BinaryResult, 2)
Else
TextBox3.Text = Convert.ToString(BinaryResult, 2)
End If
``````
``````Dim BinaryResult As Integer

If TextBox3.Text.StartsWith("-") Then
BinaryResult = -Convert.ToInt32(TextBox3.Text.TrimStart("-"c), 2)
Else
BinaryResult = Convert.ToInt32(TextBox3.Text, 2)
End If
``````
``````Private Function BinarySubtract(ByVal a As String, ByVal b As String) As String
Dim BinaryResult As Integer = Convert.ToInt32(a, 2) - Convert.ToInt32(b, 2)
If BinaryResult < 0 Then
Return "-" & Convert.ToString(-BinaryResult, 2)
Else
Return Convert.ToString(BinaryResult, 2)
End If
End Function

Private Function FromBinary(ByVal s As String) As Integer
If s.StartsWith("-") Then
Return -Convert.ToInt32(s.TrimStart("-"c), 2)
Else
Return Convert.ToInt32(s, 2)
End If
End Function
`````` 