Submission

Please, submit your solution by e-mail to: weinhold (at) os.inf.tu-dresden.de. Don't attach anything to the e-mail (like pdf, docs etc.) other than the requested source code and a Makefile within a tar-archive.

Exercise

In this exercise you are going to learn how to use GNU/Make in order to automate compiling and linking C files into an application. Perform the following steps:

1. Write a C application sincos that prints a table of sin/cos values for angles between 0 and 360 degrees. The application receives exactly one argument which is the number of steps to use for printing.

   A sample session with your program might look like this:

   			$> ./sincos 10
   			0.000           0.000           1.000
   			36.000          0.588           0.809
   			72.000          0.951           0.309
   			108.000         0.951           -0.309
   			144.000         0.588           -0.809
   			180.000         -0.000          -1.000
   			216.000         -0.588          -0.809
   			252.000         -0.951          -0.309
   			288.000         -0.951          0.309
   			324.000         -0.588          0.809
   			360.000         0.000           1.000
   			

   Your application shall consist of 2 C files:

   • main.c: This file contains the main method of your application, checks the correctness of the command line parameter and then calls a function provided by the second file in order to perform real actions.
   • sincos.c: This file provides a function that iterates over the range between 0 and 360 degrees using the steps provided by the user. For each iteration it prints the current degree value as well as its sine and cosine.
   • The interface provided by sincos.c shall be defined in a header file that is included by the main application.

2. Write a Makefile to automate your application's build. The Makefile shall consist of three rules:

   • A rule to create the program from your two object files,
   • A clean rule to remove all generated files, and
   • A rule to automatically generate dependencies.

   Furthermore, the program shall be compiled with the compiler flag -Wall and compilation should not emit any warnings.

3. Compile and link the application using GNU/Make.
4. Test the correctness of your dependencies and file generation. The reference computer for this purpose is the FRZ's Ganymed.

Sending in solutions

Solutions consist of a tarball containing all files necessary to evaluate your solution. Creating a tarball works like this:

	   	$> make clean
		..
		$> cd ..
		$> tar cvzf <your_login>_exercise1.tgz <directory>/*
		..
		

Thereafter, send <your_login>_exercise1.tgz to the email address given above.

Resources

• GNU/Make manual
• man 3 sin, man 3 cos