Description
Word processing has been one of the major applications for computers. In this assignment
you will try to write a program to perform simple word processing with a fixed character width,
such as the workstation terminal display. Today’s powerful word processors use similar concept
but with more complicated fonts and more flexible font positioning.
Let’s assume the output has N characters per line. Thus, any line which has more than N
characters will take more than one output line. It is very likely that line-change happens within a
word. This would make the output less legible. Thus, a reasonable word processor would break a
line only on word boundaries. Assuming each paragraph is read in as a single string, the number
of characters of each paragraph can be less than, equal to or larger than N. your assignment is
to write four functions:
1. int readLine(char para[LSTR]);
This function reads in a paragraph of text input as a single string and stores it in the para
array given by the function argument. The array size LSTR should be defined as a macro
in your program as the following.
#define LSTR 5000
This function is similar to the read_line function in the text book. But, the argument
is different and also this function will detect the end of the input file as following. If the
string it reads in is equal to the literal EOF then it returns 1, otherwise it returns 0. Using
this return value properly, your program can handle text files of any size.
2. void lAlign(char *para);
This function prints out a paragraph with the left edge aligned. Assuming N = 64, example
output of this function is:
“He has been phenomenal,” Bryant said. “We have watched some
tape on him. We came up with a strategy that we thought would be
effective, but he was knocking down his jump shot, penetrating
and he got around our guards.
3. void center(char *para);
This function prints out the paragraph with each line centered. Assuming N = 64, example
output of this function is:
“He has been phenomenal,” Bryant said. “We have watched some
tape on him. We came up with a strategy that we thought would be
effective, but he was knocking down his jump shot, penetrating
and he got around our guards.
Note that blank spaces are added to the beginning and the end of a line to make the line
printed at the center.
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4. void bAlign(char *para);
This function prints out a paragraph with both left edge and right edge aligned. Assuming
N = 64, example output of this function is:
“He has been phenomenal,” Bryant said. “We have watched some
tape on him. We came up with a strategy that we thought would be
effective, but he was knocking down his jump shot, penetrating
and he got around our guards.
Note that blank spaces are added evenly in the line such that both edges of the printed
line are aligned. Note also that when the remaining line has less than N characters, the it
is printed with left edge aligned.
With these functions, one can read in a text file and print it out in different formats. One
can print it with very paragraph left-edge aligned, centered or both-edge aligned. Two files are
provided for you to test your program’s capabilities. They are story1.txt and story2.txt.
Both files are ended with a line EOF .
Your program should accept two command line arguments. The first argument specifies the
line length, N, to be printed. The range of N is: 60 <= N <= 100. The second argument can
be `, c, or b. ` specifies left-edge aligned print out, c specifies centered print out, and b specifies
both-edge-aligned print out. Example running the compiled program is as follows.
$ ./a.out 64 b < story1.txt
where < story1.txt uses the unix input redirection. The content of the file story1.txt is
read in as the standard input, and thus scanf or gets can be used to read in strings directly
from the file.
Notes.
1. Create a directory lab10 and use it as the working directory.
2. Name your program source file as lab10.c.
3. The first few lines of your program should be comments as the following.
/* EE231002 Lab10. Word Processing
ID, Name
Date:
*/
4. After you finish verifying your program, you can submit your source code by
$ ∼ee231002/bin/submit lab10 lab10.c
If you see a ”submitted successfully” message, then you are done. In case you want to
check which file and at what time you submitted your labs, you can type in the following
command:
$ ∼ee231002/bin/subrec
It will show the last few submission records.
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5. You should try to write the program as efficient as possible. The format of your program
should be compact and easy to understand. These are part of the grading criteria.
