CSCI 112
Lab 2 - C Expressions

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Objectives:

• Solve a simple problem using your own C program.

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Readings:

• Read Chapters 1 and 2 in the Hanly/Koffman text.

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Deliverables: (DUE BY THE END OF THE 3^RD LAB!)

• Submittal of your lab2.c and Makefile files.

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TO DO (for today's lab)

• Design and Write a program to solve Programming Project #4 on page 103 (exactly on the same page in 6^th  edition, but p. 91 in the 5^th edition) of the Hanly/Koffman text.
• Use Linux I/O redirection to enter your temperature in Fahrenheit. Do not prompt for these values to be entered from keyboard, instead read them in from a data file using scanf in your program code, and Input/Output redirection operator provided by Linux (in the command line type (1) name of your application, (2) "<" sign and then (3) a name of your input data file). For more info on I/O redirections see the WebRefs.
• For your input data file (name it datain), build a short file including only one integer in its first line.
  Suppose you wanted to convert 156 F. You would build a file that had the following number in line one:
  156
  Make sure to call this file "datain" and save it to the same directory where lab2.c resides.
• A sample run of your program assuming "lab2" for the name of your run image would look like the following:
  $ lab2 < datain
• "<" operator will re-direct standard input for scanf command from your keyboard (default setting), to the file datain.
• A sample output (printed out on the screen) should look like the following:

Thank you for submitting temperature reading in Fahrenheit.

The temperature in degrees Celsius = 68.889.

• Note that the output needs to consist of two separate lines, and that the result of temperature conversion must be displayed with 3 digits after the decimal point.
  
• The automatic submittal script will expect your output to be formatted exactly as shown above. Make sure that your program prints out properly formatted output.
• You do not need to submit a sample data file. I will provide a set of test data files for the automatic script to use to test your program.
• Make sure to test your program thoroughly.
• Do NOT forget to document your code properly (start using comments in your code!).

LAB 2 ENRICHMENT

• Try using fscanf in your C program, to do the reading of input data.
• Note: Make sure to close the input file after you done with reading the data.
• A sample run of your program can now look like the following:
  $ lab2
• Now, there is no I/O redirection necessary
• Try using the Linux I/O redirections to print the output not on your screen but into a separate (e.g. "dataout") file.