# Operators

### 1. () + () <a href="#id-1" id="id-1"></a>

Perform mathematical addition.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-1-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-1-2.png)

Press Button A. Codey's screen will display the result of "2 + 3".

### 2. () − () <a href="#id-2" id="id-2"></a>

Perform mathematical subtraction.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-2-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-2-2.png)

Press Button A. Codey's screen will display the result of "3 - 1".

### 3. () \* () <a href="#id-3" id="id-3"></a>

Perform mathematical multiplication.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-3-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-3-2.png)

Press Button A. Codey's screen will display the result of "2 × 3".

### 4. () / () <a href="#id-4" id="id-4"></a>

Perform mathematical division.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-4-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-4-2.png)

Press Button A. Codey's screen will display the result of "6 ÷ 2".

### 5. pick random () to () <a href="#id-5-pick-random-to" id="id-5-pick-random-to"></a>

Pick a random number from the specified range.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-5-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-5-2.png)

Press Button A. Codey's screen will display the image for a random number of seconds within the range of 1 to 10.

### 6. () > () <a href="#id-6" id="id-6"></a>

If the value of the specified parameter is greater than the specified value, the report condition is met.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-6-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-6-2.png)

Shake Codey. If the shaking strength is greater than 10, Codey will play the sound "wow".

### 7. () < () <a href="#id-7" id="id-7"></a>

If the value of the specified parameter is less than the specified value, the report condition is met.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-7-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-7-2.png)

When Codey starts up, if battery level is lower than 50%, Codey's screen will display "low battery".

### 8. () = () <a href="#id-8" id="id-8"></a>

If the value of the specified parameter equals the specified value, the report condition is met.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-8-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-8-2.png)

When Codey starts up, if the red value of the object detected equals 255, Codey's LED will light up red.

### 9. () and () <a href="#id-9-and" id="id-9-and"></a>

If both the conditions are met, the report condition is met.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-9-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-9-2.png)

After starting up, Codey Rocky will keep moving forward at 50% power until red obstacle is detected.

### 10. () or () <a href="#id-10-or" id="id-10-or"></a>

If either one of the two conditions is met, the report condition is met.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-10-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-10-2.png)

When Codey starts up, Codey will play the sound "hello", if Button A is pressed or if being shaken.

### 11. not () <a href="#id-11-not" id="id-11-not"></a>

The report condition is met when the specified condition is not met.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-11-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-11-2.png)

When Codey starts up, if there no obstacle ahead, Codey Rocky will keep moving forward at 50% power.

### 12. join () () <a href="#id-12-join" id="id-12-join"></a>

Join two specified character strings.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-12-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-12-2.png)

When Codey starts up, the screen will display "hi" and "morning" together.

### 13. letter () of () <a href="#id-13-letter-of" id="id-13-letter-of"></a>

Report the letter at specified position of a character string.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-13-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-13-2.png)

When Codey starts up, the screen will display the third letter of "morning".

### 14. length of () <a href="#id-14-length-of" id="id-14-length-of"></a>

Report the length of a specified character string.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-14-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-14-2.png)

When Codey starts up, the screen will display the length of "morning."

### 15. () contains ()? <a href="#id-15-contains" id="id-15-contains"></a>

If the specified character string contains the other specified character string, the report condition is met.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-15-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-15-2.png)

When Codey starts up, if "apple" contains "a", Codey's screen will display "yes".

### 16. () mod () <a href="#id-16-mod" id="id-16-mod"></a>

Calculate the remainder (modular) of two specified numbers.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-16-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-16-2.png)

When Codey starts up, the screen will display the remainder of "9 ÷ 6".

### 17. round () <a href="#id-17-round" id="id-17-round"></a>

Round the specified number to nearest integer.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-17-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-17-2.png)

When Codey starts up, the screen will display the result of rounding 10.7.

### 18. () () <a href="#id-18" id="id-18"></a>

Perform specific mathematical operation on the specified number. Mathematical operations include: abs (absolute value), floor, ceiling, sqrt (square root), sin, sos, tan, asin, atan, acos, ln, log, e^, and 10^.

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-18-1.png)

**Example:**

![](http://docs.makeblock.com/codeyrocky/en/block-reference/images/operators-18-2.png)

When Codey starts up, the screen will display the square root of 16.<br>