C Bit Manipulation Help

[CopaceticCoffee]

Hey everyone. I'm having trouble with this homework assignment and I would really appreciate some help/hints to get me started. I've basically been given a template and I have to fill in the functions. I'm only allowed to use &, |, ^, ~, !, >>, and << operators to complete this assignment. For example, the code below is one of the functions I need to fill in. For this specific one, I need to determine if the two ints are equal and return 'true'.

bool isEqual(int a, int b){
  
  return true;
}

Let's say both a and b are equal to 7. How could I do this using only the operators listed above?
Another, slightly more difficult function I've been given is:

unsigned short flipEndian(unsigned short a){
  
  return 0;
}

For the code above, I need to return a new short with flipped bits.

I hope I'm making sense! And I really appreciate any responses!

[Duthomhas]

The isEqual() requires you to think about the bitwise operations (AND, OR, and XOR). One of those should allow you to combine the operands to get a unique result. (hint!)

The flipEndian() function requires the use of <<, >>, and &, and will require a loop. The only thing is that you will have to assume a number of bits in a short: use 16. You'll need your input (argument) and an output (initialize with zero).

Hope this helps.

[CptJY]

Hi,

To do the job, you need to figure out what is an int.

7 is 0000 0111 (lets say int is 2 bytes)

Now what using XOR :

0000 0111 XOR 0000 0111 is 0000 0000 (hint for function 1)

and

0000 0111 XOR 1111 1111 is 1111 1000 ((hint for function 2)

hope that helps

[SakurasouBusters]

What does "flipEndian" mean?
I have never heard of such a concept.

[Duthomhas]

https://en.wikipedia.org/wiki/Endianness