Computer Science 1107
AN INTRODUCTION TO FORTRAN PROGRAMMING FOR SCIENTISTS AND ENGINEERS

Fall 2001

Objective: To explore writing a FORTRAN 77 program using text and file handling.

Modified Text Problem 33, Page 710.

The Morse Code Alphabet

Be sure to do the following:

1. Create a hand-drawn flow chart for the program using the appropriately shaped boxes for start-stop, Input/Output, and computation as discussed in class OR write out the algorithm for the entire program using pseudocode which should be written out by hand, not typed.

2. Write the FORTRAN program, naming the source code file lab12.f and including an explicit list of all variables as well as a short description of the problem in a documentation section using comment lines at the beginning of the program. Be careful to choose the types of your variables appropriately and to include the names and student numbers of all authors in the documentation section.

3. The user should enter the input and output filenames which may not be the same. The input file should be OLD and the output file should be NEW. Output should be written both to the output file and to the screen.

4. Use the IOSTAT varibles to test to see if the files are successfully opened. Use ERR in both cases to print an appropriate message and to gracefully exit if there are file opening problems.

5. Be sure to think about the order of your selective testing operations. Credit will be reduced for poor programming practices such as redundant testing. This means you should give careful thought to your algorithm.

6. The space between MORSE CODE characters is one space and between words is space slash space or " / ". So, "A nice day." should be translated as: ".- / -. .. -.-. . / -.. .- -.-- .-.-.-"

7. Be sure to test for correct input from the user. If there is no possible translation for a given character or set of characters use * for each.

8. Run your program with the following files:
   
   • MCT1.dat which is text.
   • MCT2.dat which is text.
   • MCC1.dat which is MORSE CODE.
   • MCC2.dat which is MORSE CODE.
   • Some file that does not exist in your account.

9. Check your results before creating your script file.

• The flow chart OR the pseudocode listing.
• A script file containing all of the following:
• A printout of the source program obtained by using the UNIX cat command
• A compilation of the program obtained by using the f77 command
• Results of execution the program with the given data sets obtained by using a.out

Recall: For this and all programming assignments you should follow good software engineering principles including documenting your program with comments and using meaningful names for variables. Failure to do this will lead to reduced credit.

For this final programming assignment, you have the option of working in teams of two people. In this case, turn in one copy of your results with both names and student numbers included on every page of every item submitted.