Chapter 5, Problem 4PP

Program Plan Intro

Population

Program plan:

Design the form:

• Place a three text boxes control on the form, and change its name and properties to get the starting number, average daily increase, and number of days from the user.
• Place a three label boxes control on the form, and change its name and properties.
• Place a one list box control on the form, and change its name and properties to list the calculated population.
• Place a command button on the form, and change its name and properties to calculate and display the population in list box.

In code window, write the code:

Program.cs:

• Include the required libraries.
• Define the namespace “Population”.
  • Define a class “Program”.
    • Define a constructor for the class.
    • Define required functions to run “Form1”.

Form1.cs:

• Include the required libraries.
• Define namespace “Population”.
  • Define a class “Form1”.
  • In btnDisplay() method,
    • Declare the required variables.
    • Check whether the three input text box is converted into double. If yes, calculate the population and then add that items into list box.
  • Close the application.

Form Design:

View the Form Design in IDE.

Set the Form Control properties in Properties window as follows:

Object	Property	Setting
Form1	Text	Program5_4
label1	Text	Starting number of organisms:
label2	Text	Average daily increase in %:
label3	Text	Number of days to multiply:
textBox1	Text	(Empty)
textBox2	Text	(Empty)
textBox3	Text	(Empty)
listBox1	Items	(Collections)
btnDisplay	Text	Display

• Add three label box controls to the form from Toolbox.
• Add three text boxes to the form from Toolbox.
• Add one command box to the form from Toolbox.
• Add one list box controls to the form from Toolbox.