CSCI 1120 (Low-Level Computing):
Sample Programs

Disclaimer: Code linked from this page is intended as a cleaned-up and commented version of examples from class. Many programs could be further improved with regard to functionality or design, but then they would no longer be as close to what we did in class.

Programs

• "Hello, world" program (9/02): hello.c.
• Program showing very very simple input/output (9/09): simple-io.c.
• Program showing very very simple conditional execution and function (9/16): simple-fcn.c.
• Example of loop (9/23): loop-sum.c.
• Example of array access (9/23): array-test.c.
• Example of working with pointers (9/30): simple-ptrs.c.
• Example of working with strings (9/30, with additions): simple-strings.c.
• Example of working with command-line arguments (10/14): echo-args.c.
• I/O examples (10/14, with additions):
  • countchars.c.
  • countchars-fromfile.c.
  • loop-sum-fromfile.c.
• Starter for program to test sort function (not in class): sort-starter.c.
• Program to test sort function, revised to get number of elements from command-line argument and use qsort for sorting (11/04): sort-improved.c.
• Program illustrating how sizes of data types can vary (11/04): sizes.c, with output on a 64-bit system and output on a 32-bit system.
• "Floating point is strange" examples (12/02):
  • strange-float-1.c.
  • strange-float-2.c.
• Makefile example: Source code files and Makefile: directory.
• Sorted linked list and test program: Source code files and Makefile: directory.

Other files

• Script to mail files for homework submission mail-files. To use this script, put a copy in your directory and use chmod u+x to make it executable. You can then use it to mail me one or more files containing source code, for example:

  	mail-files pgm1.c pgm2.c ....
  	

  It prompts for homework number and text to include as the body of the message, and sends a Cc of the message to your username at trinity.edu.
• Sample makefile Makefile for compiling C programs. Note: To obtain a makefile, use your browser's download function; cutting and pasting will likely turn the tabs in the makefile into spaces and cause it to not work. Put the makefile in the directory in which you want to compile. All the makefiles linked from this page begin with brief documentation on their use (the "usage examples").
• Script to compile C program with recommended options compile-c. To use this script, put a copy in your directory and use chmod u+x to make it executable. Then you can type compile-c followed by the name of your source file to compile with recommended options and create an executable with a name based on the sourcefile name (e.g., hello from hello.c.