**UNIX**

PROBLEM:

1. Write a function that finds both volume and surface area of a rectangular box.
2. Write a makefile to pull all these files together.

Your function must use pointer notation (the address operator & and the indirection operator *). This function will be in a file separate and on its own.

The function prototype is:

/* Function to compute the volume and the surface area of a rectangular box */

void find_box_values (FILE *data_out, FILE *data_in,

double l, double h, double w,

double *vol, double *s_area);

You will need the file lab5.c as your main/driver program for the function. This main program will call all the subfunctions:

• open_out_file.c
• open_in_file.c
• print_headers.c
• find_box_values.c

THE FORMULAS (in algebraic notation)(must be translated to C notation):

(1) the volume of a rectangular box.

v = l * h * w

(2) the surface area of a rectangular box.

s_area = 2(l*w + h*w + h*l)

TO GET THE FILES YOU NEED:

First move to your class folder by typing: cd csc60

The following command will create a directory named lab5 and put all the needed files into it below your csc60 directory.

Type: cp -R /gaia/home/faculty/bielr/files_csc60/lab5 .

Spaces needed: (1) After the cp Dont miss the space & dot.

(2) After the -R

(3) After the directory name at the end & before the dot.

After the files are in your account and you are still in csc60, you need to type: chmod 755 lab5

This will give permissions to the directory.

Next move into lab5 directory (cd lab5), and type: chmod 644 *

This will give permissions to the files.

Your new lab5 directory should now contain: lab5.c, lab5.dat, lab5.h, open_in_file.c, open_out_file.c, print_headers.c,

INPUT/OUTPUT DESCRIPTION:

The input is a list of varying length of type double values in the file lab5.dat. Each record (or line) will have three values for the three measures of the box. The data file will have four sets of values.

The output is a chart showing the three measures of the box, the volume, and surface area.

DEFINED OUTPUT APPEARANCE:

Print statements included in the code, and require no changes, except for your name.

Your Name, Lab5.

Length Width Height Volume SurfaceArea

------ ----- ------ ------ -----------

3.70 5.00 4.20 77.70 110.08

6.80 3.00 5.90 120.36 156.44

ONLY the two lines are shown here. You should validate the correctness of the other lines.

ALGORITHM DEVELOPMENT - Pseudo code:

/*-------------------------------------------------------------------------*/

main /* main is given to you as lab5.c */

Call function open_out_file. Will open lab5.txt, mentioned in lab5.h.

Call function open_in_file Will open lab5.dat, mentioned in lab5.h

Call function print_headers Will print the column headers

Call function find_box_values You write this one.

Close the files.

/*-------------------------------------------------------------------------*/

/* This code will reside in a file find_box_values.c */

/* In a separate file from the other functions */

// You need to do a #include of lab5.h

void find_box_values(FILE *data_out, FILE *data_in, //fixed

double l, double h, double w,

double*vol, double*s_area)

while(( do an fscanf to read the l, w, h) ==3)

| Calculate the *vol

| Calculate the *s_area

|_ Print the length, height, width, volume, surfaceArea

print one more empty line.

return

/*-------------------------------------------------------------------------*/

REMINDERS:

• You should look at all the provided files and get an idea of what code each file contains.
• Remember to put your name and Lab 5 in the comment header of your function, in your makefile, and in the output.
• Remember the only operator for multiplication is the asterisk (*).
• You should examine the data file and confirm the correctness of the answer produced by your program.
• Type: vim makefile to create a makefile
• On the first lines, use # at the start of each line for comments of your name and lab5
• Write the first and final rule to link it all together.
• Line 1 of the rule: Put the name of the executable lab5, followed by a colon, followed by all the function names ending with a .o
• Line 2 of the rule: press: tab, then type: gcc. Enter the names of all the functions again ending with .o. Add in -o lab5 for the executable name.
• Example from another program:

radii: lab5.o find_two_radii.o

gcc lab5.o find_two_radii.o -o radii -lm

• Next, we must figure out what to do if any of those files listed above need to be recompiled. The make utility will check the date of the .c file against the date of .o file. If they are out of sync, then the .c file will get recompiled. The next step is to create multiple rules to take care of each file. So, to do that
  • Line 1 of the rule: put the name of the .o file followed by a colon. Then add the name of the .c and .h files that the .o file is dependent on.
  • Line 2 of the rule: type gcc -c then the name of the .c file
  • Example from another program:

find_two_radii.o: find_two_radii.c lab5.h

gcc -c find_two_radii.c -lm

• We need to repeat the above so there is a rule for each file. An empty line between each rule makes for readability. A final example for this other program would be:

#Your Name Lab 5

radii: lab5.o find_two_radii.o

gcc lab5.o find_two_radii.o -o radii -lm

lab5.o: lab5.c lab5.h

gcc -c lab5.c -lm

find_two_radii.o: find_two_radii.c lab5.h

gcc -c find_two_radii.c -lm

PREPARE YOUR FILE FOR GRADING:

When all is well and correct,

Type: script StudentName_lab5.txt [Script will keep a log of your session.]

Type: touch lab5.h to force a recompilation

Type: make to compile and link the code

Type: lab5 to run the program to show the output of the program

(or whatever name you used for the executable)

Type: cat lab5.txt to see the output of your program

Type: exit to leave the script session

Turn in your completed session:

Go to Canvas and turn in:

1. makefile
2. find_box_values.c
3. lab5.h
4. print_headers.c
5. your script session (StudentName_lab5.txt).