Example -- Enhancing Program

Code a New Message

Again open up code/text editor on Robo.java and then:

Go to our first message
Add a new message

Note: Don't forget the semi-colons ';' at the end of the lines

public void go()
{
	int n1, result;

	//PROGRAM STARTS HERE

	1showTextToUser("Hello End User, Good Day!");

	2showTextToUser("I am a Java program named 'Robo'");

Compile and Run with New Message

Again compile and run.

Our new message is shown 😊

Hello End User, Good Day!
I am a Java program named 'Robo'

Press any key to continue . . .

Get A Number

Get a number from the end user
Re-display the number to the end user

Note: Don't forget the semi-colons ';' at the end of the lines

Variables

"n1" and "result" are variables (vars). We'll learn more about variables soon.

public void go()
{
	int n1, result;

	//PROGRAM STARTS HERE

	showTextToUser("Hello End User, Good Day!");

	showTextToUser("I am a Java program named 'Robo'");

	1n1 = getNumberFromUser("Please enter a number (integer): ");

	2showTextToUser("You entered: " + n1);

Compile and Run With Prompt

Again compile and run.

Our user prompt
Our re-display of the entered number

Hello End User, Good Day!
I am a Java program named 'Robo'

1Please enter a number (integer):  10

2You entered: 10

Press any key to continue . . .

Code A Calculation

Add code to do a calculation. Our calculation doubles the entered number (variable "n1") and assigns the result to the variable named "result".

public void go()
{
	int n1, result;

	//PROGRAM STARTS HERE

	showTextToUser("Hello End User, Good Day!");

	showTextToUser("I am a Java program named 'Robo'");

	n1 = getNumberFromUser("Please enter a number (integer): ");

	showTextToUser("You entered: " + n1);

	result = n1 * 2;

Show The Result

Show the result to the user

public void go()
{
	int n1, result;

	//PROGRAM STARTS HERE

	showTextToUser("Hello End User, Good Day!");

	showTextToUser("I am a Java program named 'Robo'");

	n1 = getNumberFromUser("Please enter a number (integer): ");

	showTextToUser("You entered: " + n1);

	result = n1 * 2;

	showTextToUser("Your number doubled is: " + result);

Compile and Run With Calculation

Again compile and run.

Our program should now do:

Prompt user for a number (user entered 10 here)
Show the doubled number to the user (we calculated 20 here)

Hello End User, Good Day!
I am a Java program named 'Robo'

1Please enter a number (integer):  10
You entered: 10
2Your number doubled is: 20
I am done computing. I hope to see you again

Press any key to continue . . .