* Lab 7 - GDB
In this lab, I was looking for an error inside the q1 file provided by taking advantage of the gdb
debugger.

** Function
Just from a quick glance at the program I can tell it is supposed to take in 5 cin inputs, that
will be stored inside an array. Then using the minval function, it is supposed to return the smallest
of the inputs

#+BEGIN_SRC cpp

for (i=0; i<=5; i++){
    cin >> tmp;
    if (i=3)
      array[i]=tmp;
    else
      array[i]=10*tmp;

m = minval(array ,5);
  cout << "the smallest is " << m << endl;

#+END_SRC

However when I run the program, I get into an infinite loop of cin inputs. I thought at first it
could be an error on my side but when I run gdb and continue the steps, it is indeed looping
through the for loop over and over with no end, so there is a bug present.

I started off fixing the error that minval(a, 5) is supposed to be minval(array, 5)

#+BEGIN_SRC cpp
minval(a, 5);
//changed code
minval(array, 5);
#+END_SRC

then I compiled using
#+BEGIN_QUOTE
g++ -g q1.cpp
#+END_QUOTE

** Process
I began by launching ddd (the visual representation helps) and analyzing the
variables present. There weren't really any crashing or segfaults so I didn't put any break points.
 I started by looking at the values of "i" by typing "print i", from lines 20-23 as they were
 repeating. It wasn't incrementing properly.

 I thought what if I set the variables in gdp then make i = 5 since it's not reaching 5 what would happen. all the i values were 3

I did
#+BEGIN_QUOTE
set var array[0] = 1
#+END_QUOTE
to set variables for the array
then I did print array to view my array
(the code info local was more useful since it showed all the variables)
then I made i = 5 by doing
set var i = 5 so that it will finally go on to the next part of the function
now that it did the minval function, it returned the highest vavlue of the array.
Now I saw that my operator was "> " inside the minval function , so then I changed it to
"<" and recompiled.

I started over just to make sure that the program was running fine which it did.
the only problem left was to fix the infinite loop.
I looked at the code again and I felt so stupid that the if function had 1 equals sign not 2!

#+BEGIN_SRC cpp
if(i=3)
//changed code
if(i==3)
#+END_SRC
that means it was assigning i = 3 every time so it was looping.

after i fixed this I ran into another problem, it always returned 0!
I ran gdb again and in the minval function I noticed currmin wasn't defined so under the code

#+BEGIN_SRC cpp
if(A[i] < currmin)
#+END_SRC

It' wasnt comparing to any value so that is probably why it was returning 0.
So i added the code

#+BEGIN_SRC cpp
currmin = A[0]
#+END_SRC

The code was working so far however, it wasn't comparing the last value, then I came to the
realization
#+BEGIN_SRC cpp
 m = minval(array , 5);
#+END_SRC
by default had 5 values, when there were 6 inputs since it counts for 0 as well.

so the last change I did was
#+BEGIN_SRC cpp
 m = minval(array , 6);
#+END_SRC

I also added cout << "This value won't be multiplied by 10:"
So that I won't mistake the value that isn't multiplied by 10.

**Final Results
***Sample Input/Output
*Input*
#+BEGIN_SRC
1
2
3
This value won't be multiplied by 10: -799
-8
-80
#+END_SRC

*Output*
#+BEGIN_SRC
The smallest value is -800
#+END_SRC

** Thoughts
It was difficult to approach at first since  I wasn't that familiar with gdb but playing
around with the cheat sheet some of the things were kind of self explanatory so I think I kind
of understand the debugging process more now and why it helps. Then again some people fixed the
code apparently without the use of a debugger *cough Anna, but that doesn't always happen especially
when code gets more complicated. Therefore debuggers can really help a lot