: $1.$ The lastLine function should be modified to compute the total number of errors. If any errors occurred the number of lexical, syntactic and semantic errors should be displayed. If no errors occurred, it should display Compiled Successfully. It should return the total number of errors. $2.$ The appendError function should be modified to count the number of lexical, syntactic and semantic errors. The error message passed to it should be added to a queue of messages that occurred on that line. $3.$ The displayErrors function should be modified to display all the error messages that have occurred on the previous line and then clear the queue of messages. An example of the output of a program with no lexical errors is shown below