Week #3 - C/C++ CS 1160 - Jan 25, 27, 29

HOMEWORK SUBMISSION IS READY for programming assignment #1.
Login with your UNI CatID and passphrase.
Choose CS 1160, C++, Jacobson and then click the Continue button.
HOMEWORK SUBMIT system: C++ Homework SUBMISSION for C++ Assignments for Jacobson
ASSIGNMENT handout: Programming Assignment #1 - Magic Dates, Area of Rectangles, and Body Mass Index.
Three programs from chapter four of the textbook.
1. The three C++ programs are turned in by using a user friendly web browser based submit system.
2. You got practice with how to do that in a hands-on class on Wednesday. It will be demonstrated in class on Friday too.
3. The programs will be due and can be submitted anytime before 10 pm on Saturday, January 30th.
4. Each of your programs will have a comment block that indicates who wrote the program (your name) and what the name of the program file is.
  The program file names will be:
```
dates.cpp             All lower case letters for the file name

rectangles.cpp        All lower case letters for file name

BMI.cpp               BMI is an acronym, so all UPPER CASE letters B M I

questions.txt         This is optional, if you want to submit here instead
                          of handing the answers in on Friday during class.
```
01/27/Wednesday - The HOMEWORK SUBMIT system: C++ Assignments for Jacobson
Login with your UNI CatID and passphrase.
Choose CS 1160, C++, Jacobson and then click the Continue button.
```
The files you will upload will be named:

     forLoop.cpp
     questions.cpp               CaSe SenSiTiVe - 52 letters a != A, etc.
```

Where do I get the secure shell client so as to connect to weblab.uni.edu from home or from my laptop commputer?

its/free-software-players-and-viewers and download and then install SSH Secure Shell.

Telnet
    PuTTY              <------ Not user friendly at all
    SSH Secure Shell   <------ Download and install this one 

                               SSH Secure Shell is the one used in class.

Chapter 5 first example: WHILE loop to obtain the sum of the first n positive integers.

[jacobson@weblab ~]$   g++ loop1.cpp     COMPILE loop1.cpp
[jacobson@weblab ~]$   ./a.out           RUN (EXECUTE) the program a.out

Please enter a positive integer: 5

The sum 1, 2, ..., 5 is 15

-------------------------------   --------
Textbook Programming Challenges - page 294 of book and see Monday 01/25 handout.
-------------------------------   --------
  1. Sum of Numbers 
                             See page 233 of textbook

                             See page 239 of textbook
     Write a program that asks for a positive integer value.
     Use a loop to get the sum of all the integers 
                            from 1 up to the number entered.
     For example, if the user enters 5, the program will find
                            the sum of the 1, 2, 3, 4 and 5.

     Actors needed in this drama:

   I      Input:  n    will be the positive integer value, such as 5 or 50.
   O     Output:  sum  will be the answer obtained that is to be output.
    
   P Processing:  i    will be the variable that starts out at 1 and 
                            is incremented each time so it ranges
                            through the numbers 1, 2, 3, ..., n-1, n
                            and at each value is added to the sum.

   I P O

Here is the C++ program sample runs. More on Wednesday.

[jacobson@weblab ~]$ g++ loop1.cpp
[jacobson@weblab ~]$ ./a.out
Please enter a positive integer: 5

The sum 1, 2, ..., 5 is 15

[jacobson@weblab ~]$ ./a.out
Please enter a positive integer: 10

The sum 1, 2, ..., 10 is 55

[jacobson@weblab ~]$ ./a.out
Please enter a positive integer: 100

The sum 1, 2, ..., 100 is 5050

[jacobson@weblab ~]$ ./a.out
Please enter a positive integer: 4

The sum 1, 2, ..., 4 is 10

Here is the C++ program code.

// Page 294 - Programming Challenges problem #1.
#include <iostream>
using namespace std;

int main()
{
   int i, n, sum;

   cout << "Please enter a positive integer: ";
   cin >> n;

   i = 1;

   sum = 0;

   while (i <= n)
   {
      sum = sum + i;
      i = i + 1;
   }

   cout << "\nThe sum 1, 2, ..., " << n 
        << " is " << sum 
        << endl << endl;
}