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Can anyone explain the difference between these versions of Ubuntu?

I installed 11.10 i386 and wrote some C code that worked fine in that platform but failed to work in 11.10 amd64 on the same machine.

After debugging with valgrind and gdb I got that I was getting segmentation fault in a call to realloc() with an argument mem_ptr and size 0 passed to it.

I learned here that i386 is also referred to as 32-bit and amd64 as 64-bit, but what does this mean?

CPU: Intel i7 2nd generation

Zanna
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bikram990
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  • VTR as although this is clearly related to the called duplicate, the comments indicate a more in depth question here that doesn't appear to be a candidate for merging. – Elder Geek Sep 19 '17 at 14:06

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