C# GUI binary - and *.

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Hi guys, I'm kinda new to programming, currently self studying C# GUI atm.
How do I do binary subtraction and multiplication without using padleft method?
I managed to do the binary addition part and was told that I can reuse the addition code for multiplication.

NVM solved.

Posted 4-Sep-14 4:42am

Beta Tester

Updated 4-Sep-14 6:49am

v3

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2 solutions

Solution 1

This will convert your two binary strings to integers, you can then subtract, and return it converted back to a binary string

C#

int i = Convert.ToInt32(textBox1.Text, 2);
int j = Convert.ToInt32(textBox2.Text, 2);
Return Convert.ToString(i - j, 2);

Posted 4-Sep-14 5:10am

MarqW

Updated 4-Sep-14 5:12am

v3

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OriginalGriff · Accepted Answer · 2014-09-04T05:11:00

First off, that is some odd code you have there:

C#

for (int i = textBox1.TextLength - 1; i < textBox2.TextLength - 1; i++)
{ num1 = "0" + textBox1.Text; }

What does that do?
It's the same as:
Since the code inside the loop doesn't use the loop variable i, or change anythign other than the num1 value, it's the same as not having a loop at all - it just loads teh same value into num1 several times...

I can see what you are trying to do, sort of - but assuming that each character in num1 is zero or one (or it isn't binary) how can the result ever be three?

0 + 0 == 0
0 + 1 == 1
1 + 0 == 1
1 + 1 == 2

So the testing in your main processing loop is...um...odd.

I'd sort that out before you try to get to multiplication! :laugh:

[edit]Ignore that: I forgot the carry! :O [/edit]

So, the inner loop will work - so multiplication is pretty easy:
Think how you were taught to do multiplication:

7 * 5 == 7 + 7 + 7 + 7 + 7

Then for more advanced users there is long mutiplication:
123
*45
---
4920
+615
----
5535