C - converting to 2s complement

C - converting to 2s complement

By : master_of_puppets
Date : November 22 2020, 07:01 PM
may help you . You are talking about extended arithmetic. Most processors have carry-out and overflow results from every addition operation, but C does not provide access to them.
Your problem is that numbers get longer as they get bigger. If you're at the last bit you have, and you need to carry out, you need another bit! That means you need to reallocate the array of bits (if you are using an array).
code :

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Converting from sign-magnitude to two's complement

Converting from sign-magnitude to two's complement

By : Joris Nijs
Date : March 29 2020, 07:55 AM
it should still fix some issue For this assignment I can only use basic bitwise operators and no control structures, so I've come up with this code so far to convert sign-magnitude to two's complement. , So, what you really want to compute is
code :
result = (x & sign_bit) ? -(x & ~sign_bit) : x;
result = (x & sign_bit) ? (-1 ^ (x & ~sign_bit)) - -1 : (0 ^ (x & ~sign_bit)) - 0
Converting Decimal to Two's-Complement

Converting Decimal to Two's-Complement

By : jcullen
Date : March 29 2020, 07:55 AM
I hope this helps you . With 5 bits you can represent up to 2^5 different numbers, since you want negative and positive numbers the range is -16 to +15.
so you get error since 16 is out of the range for 5 bits. Change to 6 bits and it should work
Converting hex into two's complement 8 bit binary

Converting hex into two's complement 8 bit binary

By : Uncle.T
Date : March 29 2020, 07:55 AM
Any of those help I am in a CSCI class and we are just learning about program execution. I am running a program called "Brookshear machine simulator" which was written by the author of the class text book ( Computer Science 11th edition by J. Glenn Brookshear). The program is intended to add the contents of 11 and 0F, storing the result into F1. I have done everything necessary and produced the hex value in 11 which is 09. I am then asked to convert this into two's complement 8-bit binary, which is where I am having a problem. I will be needing to convert some hex values into two's compl 8-bit binary in the future for this lab but I cant figure out how to do it. Can someone please help me understand what twos comp is and how is it related or the same as 8-bit binary , so I can convert this to two's complement 8-bit binary? , Each hexadecimal digit has a 4 bit binary equivalent:
code :
0  0000
1  0001
2  0010
3  0011
4  0100
5  0101
6  0110
7  0111
8  1000
9  1001
A  1010
B  1011
C  1100
D  1101
E  1110
F  1111
Converting decimal to 2's complement

Converting decimal to 2's complement

By : Gowtham
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Only invert it and add 1 when you're trying to represent a negative number, positive numbers are represented with normal binary. (You just get less range in the positive numbers).
Converting from Hexadecimal to 2's complement

Converting from Hexadecimal to 2's complement

By : Stas P.
Date : March 29 2020, 07:55 AM
like below fixes the issue The for loop runs as long as i < 9 is true, but your input string is smaller. This means that you have to also check for the string ending (i < 9 && hexNum[i] != '\0'), otherwise you will access data outside of the string.
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