Assignment 5: Ascii and Boxes

Complete assignment due: Thursday, October 2nd, 9 p.m.

General notes about using C on assignments:

All C programs for this course will be compiled using gcc on lectura. The -Wall flag will be used. To receive full credit, the program must compile cleanly: no errors, no warnings. Points lost due to compilation warnings or errors can not be gotten back via a re-grade.

Problem 1 (50 points): Ascii.

Write a C program, named ascii.c that takes two command-line arguments. ascii use the atoi() function to convert the first argument to an int. It will take the first character of the second command-line argument. ascii will print two lines to stdout.

The int obtained from the first argument will be a range. The char obtained from the second argument will be the mid-point of a sequence of ascii characters. The sequence will extend for range chars on either side of the mid-point. On the first line, print the characters in the sequence. On the second line, print the same sequence, but this time convert all lower-case letters to upper-case and vice versa.

When the range will cause the sequence to start below ascii value of 1, start the sequence at 1. When the range will cause the sequence to start above the last ascii character, end the sequence at the last ascii character.

Here are some examples:

lectura-> ascii 5 'C'

>?@ABCDEFGH

>?@abcdefgh

lectura-> ascii 12 'Z'

NOPQRSTUVWXYZ[\]^_`abcdef

nopqrstuvwxyz[\]^_`ABCDEF

lectura-> ascii 1 '5'

456

lectura-> ascii 0 '5'

lectura->

Turnin: Use the turnin program to turn in your completed ascii.c program. The command is:

turnin 352assign5 ascii.c

See the man page for the turnin program for details on what turn in can do and how you can confirm that your file was turned in.

Problem 2: boxes

Write a C program named boxes.c that will print “boxes”. There will be two comand-line arguments. The first argument will specify the size of the box. Use atoi() to convert the argument to an int.

The second command-line argument will be 0 or 1. If the argument is 0, then a box consists of *’s along the top, bottom, and sides of the box. The interior spaces in the box will be blank spaces. If the argument is 1, then a box will consist of *'s everywhere; that is, the box will be filled with *'s.

We will guarantee that both command-line arguments will be present, and each will be convertible to an integer. Your program will check that the requested size is in the range 1 to 80 (inclusive). If it is outside this range, print a Usage message to stderr and return 1.

If the command-line argument is valid, print the requested box to stdout and return 0.

Some examples:

lectura-> boxes 5 0

*****

* *

*****

lectura-> boxes 1 1

lectura-> boxes -3 0

Usage: boxes size

lectura-> boxes 1040 1

Usage: boxes size

lectura-> boxes 6 1

******

Turnin: Use the turnin program to turn in your completed boxes.c file. The command is:

turnin 352assign5 boxes.c

Final Summary:

There are two files that you will need to turnin for full credit on this assignment:

ascii.c

boxes.c