Jesse Emond Jesse Emond - 1 year ago 105
C++ Question

C++ - How to print (using cout) the way a number is stored in memory?

I'm following a college course about operating systems and we're learning how to convert from binary to hexadecimal, decimal to hexadecimal, etc. and today we just learned how signed/unsigned numbers are stored in memory using the two's complement (~number + 1).

We have a couple of exercices to do on paper and I would like to be able to verify my answers before submitting my work to the teacher. I wrote a C++ program for the first few exercices but now I'm stuck as to how I could verify my answer with the following problem:

char a, b;

short c;
a = -58;
c = -315;

b = a >> 3;

and we need to show the binary representation in memory of

I've done it on paper and it gives me the following results (all the binary representations in memory of the numbers after the two's complement):

a = 00111010 (it's a char, so 1 byte)

b = 00001000 (it's a char, so 1 byte)

c = 11111110 11000101 (it's a short, so 2 bytes)

Is there a way to verify my answer? Is there a standard way in C++ to show the binary representation in memory of a number, or do I have to code each step myself (calculate the two's complement and then convert to binary)? I know the latter wouldn't take so long but I'm curious as to if there is a standard way to do so.

Thank you for your help (I couldn't find a question with a similar topic with the keywords I know so I am sorry if this is some sort of duplicate).

Also, I didn't really know which tags to pick to feel free to change them accordingly.

Answer Source

The easiest way is probably to create an std::bitset representing the value, then stream that to cout.

#include <bitset>

char a = -58;    
std::bitset<8> x(a);
std::cout << x;

short c = -315;
std::bitset<16> y(c);
std::cout << y;
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