storm.cis.fordham.edu.
Write your secret password on a piece of paper.
If you forgot your secret password,
submit
this form
to reset your secret password.
Nothing to hand in this week.
Compare
binary.C,
which outputs an integer as 32 bits,
with
hexadecimal.C,
which outputs an integer as 8 hex digits.
Each hex digit is an abbreviation for a series of four bits.
(A series of four bits is called a nibble.)
Can you compile and run these two C++ programs in your home directory on
storm.cis.fordham.edu?
Do you understand why the first for loop in
loop.C
has to perform an invisible multiplication and addition
each time you evaluate the expression
a[i]?
Do you understand how the second
for
loop avoids this hidden arithmetic?
Play with the Linux commands.
If you put a file in the public_html subdirectory of your
home directory on storm.cis.fordham.edu,
see if it shows up
here.
(You may have to refresh
this page
in your browser.)
bintodec1.C
(in
bintodec2.C,
bintodec3.C,
bintodec4.C)
to catch the
invalid_argument
and
out_of_range
exceptions (and any other exceptions) that might be thrown by the function
stoi.
Admire how sdg5 generated the hexadecimal digits from
right to left,
and then loaded them into the array result
starting at the end of the array and working forward,
in his program
hexadecimal.C.
Compare to this
hexadecimal.C.
Note the similarities between the following programs:
rocket.C
looped through an array,
and used a pointer (p) to access four consecutive elements
of the array
(p[0],
p[1],
p[2],
p[3])
during each iteration of the loop.
(Does
rocket.C
run smoothly on your Apple Macintosh or Windows PC?
Are you really serious about animating the recursive
maze.C
program we ran last semester?)
movingaverage.C
looped through an array,
and used a pointer (p) to access five consecutive elements
of the array
(p[-2],
p[-1],
p[0],
p[1],
p[2])
during each iteration of the loop.
bubblesortintptr.C
looped through an array,
and used a pointer (q) to access two consecutive elements
of the array
(q[0],
q[1])
during each iteration of the loop.
The program
passstruct.C
began with the blueprint for a new type of structure
(called a month).
It created a variable named j
of this type, and passed the address of this variable to a function named
f.
The function received this address as a pointer named p,
and used the pointer to access the two fields inside of j.
The blueprint for month
had to be written up above the
main
function, to make it possible to mention the word month
in both of the functions main
and f.
Imitating
passstruct.C,
write a C++ program that has a blueprint for an interesting type of structure
containing a few fields.
Then create a variable of this type in the main function,
and pass the address of the variable down to another function.
The other function will receive the address as a pointer named p
and will use the pointer to access the fields inside of the structure.
Have the function do something interesting with the structire,
not merely outputting the fields of the structure.
Name your program
structure.C,
and put it in the
public_html
subdirectory of your home directory
on
storm.cis.fordham.edu
by 6:00 p.m. EST on Wednesday, January 29, 2025.
For more inspiration, look at
struct.C.
It creates a structure named tomorrow,
and passes the address of tomorrow
down to the one-argument next function,
which does an elaborate computation to change the three fields inside
of
tomorrow
to the following day’s date.
Good luck.
date in
obj1.C
already has the following two non-const
member functions:
void next(int n); //Go n days into the future. void next(); //Go 1 day into the future.Add two more non-
const
member functions
void prev(int n); //Go n days into the past. void prev(); //Go 1 day into the past.that will make the object to which they belong move into the past.
Test your new functions by making a date
object that contains March 1, 2025.
Make the object go 1 day into the past and verify that it changes into
February 28, 2025.
Put this program into a file named
prev.C
in the
public_html
subdirectory of your home directory on
storm.cis.fordham.edu
by Wednesday, February 5, 2025 at 6:00 pm EST.
Also by next Wednesday,
make a C++ program named interesting.C
in your public_html
that creates a class, and creates one or more objects of that class,
and calls one or more member functions of these objects to do something
interesting.
A simple but spiritless possibility would be to create a class
time
containing three data members named
hour,
minute,
second,
very similar to the class date in
obj1.C.
An experiment you could try:
what is the biggest number of integers you can say you want to store on
storm.cis.fordham.edu
in the program
new3.C
without throwing an exception?
Is it always the same number?
The Rose Hill tutoring room, John Mulcahy Hall room 310, is open 11:30–5:15 M–F (only until 4:00 pm on Monday until they find coverage).