Most programming environments (IDEs) provide a method of stepping line-by-line through code. This allows
programmers to examine the contents of identifiers and follow the execution path precisely. Stepping through a coded solution is essentially an automated desk check of the code.
Most IDEs provide a window where the current contents of each identifier is shown and updated as execution
progresses. It is usually possible to alter the value of identifiers and even make corrections to the code before execution is recommenced.