## Introduction: HP Prime Programming Tutorial: Displaying Results

This instruction isn't intended to be a primary location of learning to program the HP Prime. These are a few things I've spent hours learning and just want to share so another novice programmer can get up and running faster. The 600+ page manual offered by HP does a good job clarifying syntax and how to get started in programming.

For now, I'm just covering how to display program results.

## Step 1: Displaying Results

Depending on what you want to display, there are several options.

- Display a single number (47)
- Display a single number and text (A=47)
- Display multiple numbers (47, 13)
- Display multiple numbers and text (A=47 and B=13)

And another influence is do you want to do more calculations with them?

Once you add text to your program results, you are no longer allowed to do calculations. I prefer not using text because I can't do further calculations with the result (unless I type it on the home screen myself).

When trying to display two or more numbers in a result and still do calculations, I use a matrix or a list.

Here are various syntax examples, (let A and B represent program variables and A=47 and B = 13)

## Step 2: Displaying: Example 1

RETURN A;

// This will return a value to the home screen, which can be used in future calculations

## Step 3: Displaying: Example 2

RETURN "The answer is "+A;

// this returns a string, no further calculations can be done with result, only viewing.

## Step 4: Displaying: Example 3

RETURN "A value is " + A + " B value is" + B;

// displays a string, only viewing is allowed, no further calculations can be done.

## Step 5: Displaying: Example 4

M1(1) refers to matrix one and the first element in the matrix.

M1(2) refers to matrix one and the second element in the matrix.

RETURN M1;

Matrixs allow the display of multiple numbers from a program's results as well as allowing you to do further as seen in the pic.

In order to use a matrix, you must go to the matrix list on the HP Prime, and select M1(our matrix of choice), then choose it to be a vector.

For more information on Matrixs, refer to the HP User Guide

## Step 6: Displaying: Example 5

L1(1) refers to List 1 and it's first element.

L1(2) refers to List 1 and it's second element.

RETURN L1;

Lists allow the display of multiple numbers from a program's results as well as allowing you to do further as seen in the pic.

For more information on Lists, refer to the HP User Guide

## Step 7: Displaying Numbers in Decimal Form

To get you program to return decimal values, use

RETURN approx(A);

the approx will approximate the variable A giving you a decimal answer.

Or, you can run the program from the CAS home, then press the button left of the delete button.