- Pre-Programming Activity
-
You must
sign up
for the protected portion of the Web site.
You must do this even if you were in CSCI1226 in the fall --
it's a different web site.
You will not be allowed to pass in your labs or assignments
until you have signed up.
Your username for the site is your A-number.
Your initial password is also your A-number.
You'll choose a new password as part of the registration process.
If you were not regiatered in the course Monday morning (the 4th),
then you will have to contact your lab instructor
to ask to be added to the permitted list for the site.
- Activity #1
-
Look at this C++ code:
/*
Illustrates how to make a program pause and wait for the user to press
Enter befoe continuing, an often useful "user interface" feature.
Author: Porter Scobey
Author: Mark Young
*/
#include <iostream>
using namespace std;
int main() {
// create variables
int someInteger;
double someDouble;
string someWord, anotherWord;
// introduce yourself
cout << "\nThis program illustrates how to create a \"pause\" in "
"the output of a program,\nso that a user may read the preceding "
"output before continuing. The user then \ncontinues by pressing "
"the Enter key.\n";
// The following code causes the program to pause and wait
// for the user to press the Enter key before continuing.
// BUT ONLY IF INPUT STREAM cin IS EMPTY WHEN THE CODE EXECUTES
cout << "\nPress Enter to continue ...";
cin.ignore(80, '\n');
// The following three code sections read values and tidy the
// input stream before going on to read the next value.
// first an integer ...
cout << "\nEnter an integer value here: ";
cin >> someInteger;
cin.ignore(80, '\n');
cout << "The integer you entered was " << someInteger << ".\n";
// second a real number ...
cout << "\nEnter a real value here: ";
cin >> someDouble;
cin.ignore(80, '\n');
cout << "The number you entered was " << someDouble << ".\n";
// finally a couple of words ...
cout << "\nEnter two words here: ";
cin >> someWord >> anotherWord;
cin.ignore(80, '\n');
cout << "The words you entered were '" << someWord << "' and '"
<< anotherWord << "'.\n";
// Once again, we wait for the user to press the Enter key before
// continuing. And AGAIN ONLY BECAUSE THE INPUT STREAM IS EMPTY
cout << "\nPress Enter to continue ...";
cin.ignore(80, '\n');
cout << "\n";
}
Create a Java program class called Pausing
that is a direct translation
of the code above into Java.
That means you make your Java program do all the things that C++ program does,
and in the same order.
Include comments,
translated to javadoc where appropriate.
Add yourself as an author.
I know that most of you have never used C++ before,
but it shouldn't matter.
You should know enuf about programming
to be able to figure out
what the code above is doing
and how to do the same things in Java.
- Activity #2
-
Look at this Pascal code:
{
A program to find the maximum of user's input.
Author: Mark Young
}
program getmax(input, output);
VAR
count, number, maximum: integer;
BEGIN
// initialize variables
count := 0;
maximum := -1;
// introduce yourself
writeln();
writeln('Enter numbers below. Enter a negative number to end input.');
read(number);
while number >= 0 do
begin
count := count + 1;
if maximum < number then
maximum := number;
read(number)
end;
readln();
// pause
writeln();
write('...press enter...');
readln();
// report results
writeln();
writeln('The maximum of the ', count, ' numbers you entered was ',
maximum, '.');
writeln()
END.
Create a Java program class called GetMax
that is a direct translation
of the code above into Java.
That means you make your Java program do all the things that Pascal program does,
and in the same order.
Include comments,
translated to javadoc where appropriate.
Add yourself as an author.
I know that most of you have never used Pascal before,
but it shouldn't matter.
You should know enuf about programming
to be able to figure out
what the code above is doing
and how to do the same things in Java.
- Activity #3
-
Look at this Python code:
"""
Code to read a number and calculate its factorial
Author: Mark Young
"""
# get input
n = int(input('Type a number, and its factorial will be printed: '))
# check for valid input
if n < 0:
print('You must enter a non negative integer')
else:
# calculate factorial for valid input
fact = 1
for i in range(2, n + 1):
fact *= i
print("%d! is %d"%(n, fact))
Create a Java program class called Factorial
that is a direct translation
of the code above into Java.
That means you make your Java program do all the things that Python program does,
and in the same order.
Include comments,
translated to javadoc where appropriate.
Add yourself as an author.
I know that most of you have never used Python before,
but it shouldn't matter.
You should know enuf about programming
to be able to figure out
what the code above is doing
and how to do the same things in Java.
- Activity #4
-
Translate getmax (see Activity #2 above) to Python (see Activity #3).
Include appropriate comments,
including yourself as an author.
Don't worry too much about testing.
Just try to use the sort of syntax you see in the Python code.
I'll be generous in interpreting the code.
(And it's only one point.)