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Mark: 3 revision(s)
2008-11-03T05:18:57Z
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<p><b>New page</b></p><div>===Task 1===<br />
<br />
The output for Task 1 was the same (size of pointer) regardless of the different types (short,double,float,integer,long).<br />
<br />
Lab machine<br />
<pre><br />
ip = 4<br />
ip2 = 4<br />
ip3 = 4<br />
ip4 = 4<br />
ip5 = 4<br />
ip6 = 4<br />
</pre><br />
<br />
Even more surprising is that the Linux Server has exactly the same values as the lab machine<br />
Linux server<br />
<pre><br />
ip = 4<br />
ip2 = 4<br />
ip3 = 4<br />
ip4 = 4<br />
ip5 = 4<br />
ip6 = 4<br />
</pre><br />
<br />
I conclude that I do not know what is going on, or why.<br />
<br />
===Task 2 + 3===<br />
<br />
In Task 2 the output varied without an obvious logical pattern.<br />
<br />
The "(long)(&x) - (long)(&y)" resulted in 2 memory addresses that are quite close to each other.<br />
<pre><br />
longx longy<br />
&x = 0x22ccc4, &y = 0x22ccc0, diff = 4<br />
</pre><br />
<br />
The "(long)(&x - &y)" produced numbers that are quite puzzling.<br />
<pre><br />
long(x-y)<br />
*char0*&x = 0x22ccc4, &y = 0x22ccbc, diff = 2<br />
*char1*&x = 0x22ccc4, &y = 0x22ccbc, diff = 2<br />
*char2*&x = 0x22ccc4, &y = 0x22ccbc, diff = 2<br />
*char3*&x = 0x22ccbc, &y = 0x22cc9c, diff = 8<br />
*char4*&x = 0x22ccc4, &y = 0x22ccbc, diff = 2<br />
*char5*&x = 0x22ccbc, &y = 0x22cc9c, diff = 8<br />
*char6*&x = 0x22ccbc, &y = 0x22cc9c, diff = 8<br />
*char7*&x = 0x22ccbc, &y = 0x22cc9c, diff = 8<br />
*char8*&x = 0x22ccc4, &y = 0x22ccb4, diff = 4<br />
*char9*&x = 0x22ccbc, &y = 0x22cc9c, diff = 8<br />
*char10*&x = 0x22ccbc, &y = 0x22cc9c, diff = 8<br />
</pre><br />
<br />
Over to the linux server the output was a lot different with all the differences being the same.<br />
<br />
<pre><br />
long(x-y)<br />
*char0*&x = 0x22ccc4, &y = 0x22ccbc, diff = 1<br />
*char1*&x = 0x22ccc4, &y = 0x22ccbc, diff = 1<br />
*char2*&x = 0x22ccc4, &y = 0x22ccbc, diff = 1<br />
*char3*&x = 0x22ccbc, &y = 0x22cc9c, diff = 1<br />
*char4*&x = 0x22ccc4, &y = 0x22ccbc, diff = 1<br />
*char5*&x = 0x22ccbc, &y = 0x22cc9c, diff = 1<br />
*char6*&x = 0x22ccbc, &y = 0x22cc9c, diff = 1<br />
*char7*&x = 0x22ccbc, &y = 0x22cc9c, diff = 1<br />
*char8*&x = 0x22ccc4, &y = 0x22ccb4, diff = 1<br />
*char9*&x = 0x22ccbc, &y = 0x22cc9c, diff = 1<br />
*char10*&x = 0x22ccbc, &y = 0x22cc9c, diff = 1<br />
</pre><br />
<br />
In Lab2 I was presented with many errors but mostly minor ones. Some of them which the lecturer said was ok as we are only experimenting.</div>
Mark