The weight in pounds of a walleye (a species of freshwater fish) can be calculated from its length and girth in inches according to the following formula:

where scalefactor is constant and equal to 800. Using the vi editor, write a C program on the Sun cluster that:

• declares the constant scalefactor
• prompts the user for the length and girth of a walleye.
• reads the length and girth from the keyboard. The following sequence of statements can be used for the prompts and for reading double values into double variables length and girth

    printf("Enter the length of the walleye: ");
    scanf("%lf", &length);
    printf("Enter the girth of the walleye: ");
    scanf("%lf", &girth);

• uses the length and girth to compute the weight of the walleye according to the above formula, and assigns the weight to a variable of the appropriate type.
• prints the weight of the walleye. If the variable holding the weight is called weight, then it can be printed as follows:
  • if weight is an int, use:

      printf("The weight of the walleye is: %d\n", weight);

  • if weight is a float, use:

      printf("The weight of the walleye is: %f\n", weight);

  • if weight is a double, use:

      printf("The weight of the walleye is: %lf\n", weight);

Hints: you can copy or ftp the file prog1.c from the pub subdirectory of my home directory. This file contains a template with comments sugggesting where to put various parts of your program. If you don't use this template, you will need to have the line:

#include <stdio.h>

in your program before the line:

  main() {

A test case: a walleye with a length of 32 inches and a girth of 19.5 inches should weigh 15.21 pounds.

Either turn in a print out of your program, or email it to me at wahls@psu.edu. If you email me the program, I will email you an acknowledgement when I receive it, and will email you again with your score and comments after the due date. Your program will be graded on correctness and appropriate use of comments.

• About this document ...