C question.

Anikom15 · 2009-12-15 01:32:45

As a challenge, I decided to try making a simple CPU emulator. When I try to execute the program, I get segmentation faults.

What exactly is a segmentation fault? How do I get rid of it?

#include <stdio.h>

main()
{
        int ram[0xffff];
        int pcounter;
        int somevalue = 5;

        ram[0x1024] = 0xff;

        somevalue = ram[pcounter];
        switch (somevalue) {
                case 5:
                        printf("Hello, World!");
                        break;
                default:
                        break;
        }
        return 0;
}

Anikom15 · 2009-12-15 02:06:25

Nvm, I figured it out. I'm such a noob.

Cerebral · 2009-12-15 14:40:53

What exactly is a segmentation fault?

This may help better your understanding: http://en.wikipedia.org/wiki/Segmentation_fault

tlvb · 2009-12-15 16:06:20

Commenting on a non-issue here, but I guess my curiosity got the best of me;
Why 0x1024? 1024 is a power of two and would make some kind of sense in that everything boils down to binary, so powers of two are nice.
But in hex 1024 is 0x0400...

tomd123 · 2009-12-15 16:23:25

tlvb wrote:

Commenting on a non-issue here, but I guess my curiosity got the best of me;
Why 0x1024? 1024 is a power of two and would make some kind of sense in that everything boils down to binary, so powers of two are nice.
But in hex 1024 is 0x0400...

You're completely right, OP should take note
That's probably the only reason he used 1024.

Arch Linux

#1 2009-12-15 01:32:45

C question.

#2 2009-12-15 02:06:25

Re: C question.

#3 2009-12-15 14:40:53

Re: C question.

#4 2009-12-15 16:06:20

Re: C question.

#5 2009-12-15 16:23:25

Re: C question.

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