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Computing and Networking Using C in UNIX

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UNIX C

Overview

This document contains the following topics:

• Creating C files
• Compiling and running
• Compile options
• Example program
• Available references

Creating C Files

Example using EMACS to edit a C file:

				gemacs  file-name.c

Compiling And Running

				cc  file-name.c
					or
				gcc  file-name.c

Technical Note: There are two standard C formats: ANSI and K&R. gcc compilers work with both ANSI and K&R. cc compilers usually use one or the other: ANSI or K&R. For more information type "man cc" or "man gcc" at the UNIX prompt.

				a.out

Compile Options

 -O   Name  the  final executable file (if this option is not used 
      the file created will be called a.out)

				cc -o  out-file-name file-name.c
					or
				gcc -o  out-file-name file-name.c

Example Program

   main()
   {
      float   x, y, z, sum, avg;
                            
      printf("Please enter 3 numbers: ");
      scanf("%f %f %f", &x, &y, &z);
      sum = x + y + z;
      avg = sum / 3.0;
      printf("The average of the three numbers is: %f\n",avg);
    }                  

For More Information

On-line manual pages for the C compiler, C library functions, and other UNIX commands are available. Computing and Networking also maintains a current copy of UNIX manuals including C.