program correction examples

=======
def oddTuples (x0 ):
  x1 =()
  for x2 in range (len (x0 ))
    if x2 %2==0:
    x1 =x1 +x0 [x2 ]
  return x1 

def oddTuples (x0 ):
  x1 =()
  for x2 in range (len (x0 )):
    if x2 %2==0:
      x1 =x1 +(x0 [x2 ],)
  return x1 

===========  
def oddTuples (x0 ):
  x1 =()
  for x2 in range (len (x0 )+1):
    if x2 %2==1:
      x1 =x1 +(x0 [x2 -1:x2 ])

def oddTuples (x0 ):
  x1 =()
  for x2 in range (len (x0 )+1):
    if x2 %2==1:
      x1 =x1 +(x0 [x2 -1:x2 ])
  return x1 
  
========
def oddTuples (x0 ):
  x1 =()
  for x2 in x0 :
    if x2 %2==0:
      x1 =x1 +(x2 ,)
  return x1 

def oddTuples (x0 ):
  x1 =()
  x2 =0
  for x2 in range (len (x0 )):
    if x2 %2==0:
      x1 =x1 +(x0 [x2 ],)
  return x1 
========

NOVEL SOLUTION:

def evaluatePoly ( x0 , x1 ) : 
  x2 = 0 
  x3 = 0.0 
  for x2 in range ( 0 , len ( x0 ) - 1 ) : 
    x3 = x0 [ x2 ] * x1 ** x2 + x3 
    x2 += 1 
  return x3 

corrected prog 
def evaluatePoly ( x0 , x1 ) : 
  x2 = 0 
  x3 = 0.0 
  while x2 in range ( len ( x0 ) ) : 
    x3 = x0 [ x2 ] * x1 ** x2 + x3 
    x2 += 1 
  return x3 
  
\paragraph{Fixing type mismatch} The incorrect program mistakenly raised a number x1 to a power of a list [x3].
\begin{lstlisting}
# incorrect prog 
def evaluatePoly ( x0 , x1 ) : 
  x2 = 0.0 
  for x3 in range ( len ( x0 ) ) : 
    x2 = x2 + (x0[x3] * (x1 ** [x3])) 
  return x2 

# corrected prog 
def evaluatePoly ( x0 , x1 ) : 
  x2 = 0.0 
  for x3 in range ( len ( x0 ) ) : 
    x2 += x0 [ x3 ] * x1 ** x3 
  return x2 
\end{lstlisting}

\paragraph{Fixing missing indentations} The incorrect program forgot to indent the first line (remember that python use relative indent and dedent so only 1 line is corrected here).

\begin{lstlisting}
# incorrect prog 
def evaluatePoly ( x0 , x1 ) : 
x2 = 0.0 
for x3 in range ( 0 , len ( x0 ) ) : 
  x2 += x0 [ x3 ] * x1 ** x3 
return x2 

# corrected prog 
def evaluatePoly ( x0 , x1 ) : 
  x2 = 0 
  for x3 in range ( 0 , len ( x0 ) ) : 
    x2 += x0 [ x3 ] * x1 ** x3 
  return x2 
\end{lstlisting}

\paragraph{Inserting a missing update function} The incorrect program forgot to add an update to the variable x3 inside the loop.
\begin{lstlisting}
# incorrect prog 
def evaluatePoly ( x0 , x1 ) : 
  x2 = 0 
  x3 = 0 
  for x4 in x0 : 
    x2 = x2 + ( x4 * ( x1 ** x3 ) ) 
  return x2 

# corrected prog 
def evaluatePoly ( x0 , x1 ) : 
  x2 = 0 
  x3 = 0 
  for x4 in x0 : 
    x2 = x2 + ( x4 * ( x1 ** x3 ) ) 
    x3 += 1 
  return x2 
\end{lstlisting}

\paragraph{Suggesting to use the enumerate function} Our algorithm replaced the original for loop with a for loop that uses enumeration, it also re-named the variables in the update call inside the loop to match.
\begin{lstlisting}
# incorrect prog 
def evaluatePoly ( x0 , x1 ) : 
  x2 = 0 
  for x3 in x0 : 
    x2 += x3 * ( x1 ** x4 ) 
    x4 += 1 
  return x2 

# corrected prog 
def evaluatePoly ( x0 , x1 ) : 
  x2 = 0 
  for x3 , x4 in enumerate ( x0 ) : 
    x2 += x4 * ( x1 ** x3 ) 
    x4 += 1 
  return x2 
\end{lstlisting}

\paragraph{Suggestion of a novel program} This novel suggestion fixes the incorrect program by replacing the ``for'' loop with a very strange ``while'' loop, which only work because of the extraneous update function ``x2 += 1'' present in the incorrect program.
\begin{lstlisting}
# incorrect prog
def evaluatePoly ( x0 , x1 ) : 
  x2 = 0 
  x3 = 0.0 
  for x2 in range ( 0 , len ( x0 ) - 1 ) : 
    x3 = x0 [ x2 ] * x1 ** x2 + x3 
    x2 += 1 
  return x3 

# corrected prog 
def evaluatePoly ( x0 , x1 ) : 
  x2 = 0 
  x3 = 0.0 
  while x2 in range ( len ( x0 ) ) : 
    x3 = x0 [ x2 ] * x1 ** x2 + x3 
    x2 += 1 
  return x3 
\end{lstlisting}