Classwork 5

Logistics

  • Due: Wednesday, February 1st AoE.
  • Submission instructions: make sure that the required file (remainder.c) is in your /classwork/week3/wed/ directory.
  • Deadline reminder: after the deadline passes, you cannot earn any points for this assignment.

Learning outcomes

  • Write a function that takes in two inputs and returns one output.
  • Use a function prototype and define your function below main.

Assignment

  • Log in to the server.
  • From your home directory, navigate to classwork/week3/wed/, creating directories week3 and wed if necessary.
  • Inside this directory, create a file called remainder.c. In it, write a program solving the following problem.

Prompt the user for two integers, one to use a dividend and one to be used as a divisor. Write a function rem that takes in both integers and returns the remainder when dividing the dividend by the divisor. In main, print the dividend, divisor, and remainder. As usual, your output must exactly match the sample. That is, you should exactly match the following for the input 12 4:

Please enter two integers separated by whitespace: 12 4
When dividing 12 by 4, the remainder is 0.

Use a function prototype and define your function below main, like this:

// function prototype for rem here

int main(void) {
	// call rem in here
}

// define rem here

Hints

  • The % (mod operator) computes the remainder. For example, 12 % 4 returns 0, whereas 22 % 10 returns 2.
  • Develop your program in steps, checking that it compiles and runs after every significant change.
  • It is standard to include a newline (\n) at the end of the last line of any file; thus, your final print statement should include a newline at the end. If you get the error \ No newline at end of file in your diff below, it’s because you’re missing the newline.
  • You can check that you will get full credit for this assignment by compiling your program, running it and saving its output to a file, and comparing that file to the example output. Specifically, do:
    gcc -o exe -Wall remainder.c
./exe < /public/classwork/week3/wed/test_input.txt > output.txt
diff -w -i ~/classwork/week3/wed/output.txt /public/classwork/week3/wed/expected_output.txt

    You will see any warnings during compilation and any differences between your output and the expected output on the screen. If nothing happens, the content of your output file exactly matches the expected content and there were no warnings when compiling. As long as your file is in the correct place and named correctly, this means that you will get full credit for the assignment.

Grading turnaround

Preliminary results via autograder will be present in the appropriate classwork directory in the autograder.txt, refreshed every 5 minutes from 8am to 11am on the class day, and then every hour until 6am the following day. The 6am run is the final grade. Scores will be uploaded to D2L by the next class period.