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

Fall 2001

Objective: To explicitly use the four stages of program development in the creation of a small FORTRAN 77 program.

Text Problem 13, page 109.

DIAM = (16*TORQUE/STREN)**(1.0/3.0)

If POWR horsepower is applied to the shaft at a rotational speed of RS rpm, the torque is given by:

TORQUE = 63000*POWR/RS

For this assignment, create a FORTRAN program that gets values for POWR, RS, and STREN as input from the user and then calculates and displays the torque developed and the required diameter to transmit that torque using the following steps:

1. Create a hand-drawn flow chart for the program using the appropriately shapes boxes for start-stop, Input/Output, and computation as discussed in class.
2. Write out the algorithm for the entire program using pseudocode. This should be written out by hand, not typed.
3. Write the FORTRAN program, naming the source code file lab2.f and including an explicit list of all Input and Output 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.
4. Run the program with the following inputs:

   POWR (HP)	RS (rpm)	STREN (psi)
   20	1500	5000
   20	50	5000
   270	40	6500

   Check your results by hand before creating your script file.

5. Then hand in the following:
   • The flow chart.
   • 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 three data sets obtained by using a.out

Note: 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 and subsequent assignments, you have the option of working in teams of two people. In this case, turn in one copy of your results with both names included on every page of every item submitted.