CSCI 1301 – Lab 05

Clément Aubert

January 22, 2019

Reading From the User

  1. Download the PersonalizedWelcomeMessage project.
  2. Extract it, and open it in VS.
  3. Compile and execute it.
  4. You will be prompted with the message

    Please, enter your first name, followed by “Enter”:

    Enter your first name, followed by Enter ↵. You just witnessed an interaction between a program and an user!

  5. Read the source code, and make sure you understand all of it.
  6. Change the code, so that the program would also ask the user’s last name, and print both their first and last names.

Numeric Datatypes

For this part, I recommend opening the web page, printable version or editable version of the document I mentionned in class. Note that it contains numerous references at its end.

Experimenting

Compute in your head the result of the following operation: 1000000.0 + 1.2 − 1000000.0.

Now, implement it (read as “Create a new project and copy that code in the Main method”) using float, double, and decimal:

Can you explain what you just observed?

Now, execute the following code:

Can you explain the gradual loss of precision?

Making Simple Calculations

This part should be first carried out without using VS.

Assume we have the following statements:

Answer the following:

Operation Legal? Result Datatype
a + d Yes 19.7 double
m + f No _ _
a / b _ _ _
b * f _ _ _
d + f _ _ _
d + b _ _ _
a + m _ _ _
f / m _ _ _
d * m _ _ _

You can check your answers using VS: create a new project, copy the variables declarations and assignments, and write your own statements to perform the calculations in the Main method. For instance, if you want to check that the result of a + d is of type double, write something like