$1\mathrm{.}14$ zyLab training: Interleaved input $/$ output

Auto$-$graded programming assignments have numerous advantoges, but have some challenges too. Students commonly struggle with realizing that example input $/$ output provided in an assignment's specification interleaves input and output, but the program shou'd only output the output parts. If a program should double its input, an instructor might provide this example

Enter X:

$5$

$x$ doubled is: $10$

Students often incorrectly create a program that outputs the $5.$ Instead, the program should only output the output parts:

Enter x:

$x$ doubled is: $10$

The instructor's example is showing both the output of the program, AND the user's input to that program, assuming the program is developed in an environment where a user is interacting with a program But the program itseif doesn't output the $5($or the newline following the $5,$ which occurs when the user types $5$ and presses enter$).$

Aso, if the instructor configured the test cases to observe whitespace, then according to the above example, the program should output a newline after Enter $x$ : $($and possibly after the $10,$ if the instructor's test case expects that$)$

The program below incorrectly echoes the user's input to the output.

Try submitting it for grading $($click 'Submit mode', then 'Submit for grading"$)$ Notice that the test cases fail The first test case's highlighting ind cates that output $3$ and newline were not expected. In the second test case, the $-5$ and newine were not expected.

$2$ Remove the code that echoes the user's input back to the output, and submit again. Now the test cases should all pass