# Operators (20/20)

# 1. numerical value

• Enter a integer or decimal, and return in value type. It can be dragged into a circular or semicircle frame.

# 2. fundamental operation

• Perform the selected operation of four operations or exponentiation operation (+,-，*，/ and ^).

• Drop-down list:

# 3. random number

• Pick a random number within the input closed interval. If the range is 0 to 5, 0 and 5 is included.

• Please note: the input number must be integer.

• Application: random numbers are widely used in games. They can make obstacles appear randomly, or make roll dice effect.

# 4. determine-number type

• It is a Boolean type block, which would return either true or false.

• Report true if input is the given type.

• Please note: if the condition is "prime", this block can detect prime less than 50000.

# 5. determine-divisible

• It is a Boolean type block.

• Report true if the first value is dividable by the second value.

# 6. <condition1> [and] <condition2>

• [and] Report true if both conditions are true.

• [or] Report true if either condition is true.

# 7. math expression ( "1+2" )

• Return instant outcome of the specified math expression like four operations (+,-，*，/ ), exponentiation operation ( ^) and trigonometric function (sin, cos, tan).

• Please note: only supports the use of mathematical symbols in English input methods. It cannot be used with variable or list at the same time.

# 8. operation

• Compute the operation and return the value.

• Drop-down list:

# 9. remainder

• Return the remainder after the first value divided by second value.

• For example: the reminder of 64÷10 is 4.

# 10. trigonometric function

• Return the outcome after the calculation of trigonometric function.

# 11. round

• Round value to other value in selected rounding form.

• For example:

  Round 3.1 = 3 (round)

  Round up 3.1 = 4 (minimum integer greater than 3.1)

  Round down 3.1 = 3 (maximum integer less than 3.1)

# 12. determine-value comparison

• It is a Boolean type block.

• Return true if two parameters follow the chosen kind of algorithms.

# 13. determine-true or false

• It is a Boolean type block.

• Set the condition true or false.

# 14. determine-false

• Return true if the condition is false, and vice verse.

• For example:

  <3=4> is false, so the condition is fulfilled. Then it is true.

  

  <4=4> is true, so the condition is not fulfilled. Then it is false.

  

# 15. string

• Return the input character string after typing in number or text.

• Tip:

  Variable and the value of the list are numeric type by default. If you want to add variable values of literal type, you need help from string module.

# 16. combine strings

• To combine two or more text or numbers together.

• Application: this block is ofren used with "say" block to report the score or count down.

# 17. string length

• Return the length of input text. Text can be letters, Chinese or number.

# 18. substring

• Return all characters from X to Y of the specified string.

• For example:

# 19. determine-contain

• It is a Boolean type block.

• Decide if the first string contains the second string.

• For example:

# 20. generate list

• Split the specified string into an array of substrings based on the delimiter and it usually matches with relating List blocks.