5. operators

Many programs make use of an operator to carry out mathematical calculations.

For example, a tables testing program needs to multiply two numbers.

The two numbers will be entered into two variables.

These variables could be named number1 and number2.

The * multiplication operator is used to multiply number1 x number2.

Look at the image below to find out how the multiplication operator is used

The 4 common mathematical operators are:

Q15. What are the 4 common mathematical operators?

Study the program script below.

first_number and second_number are the variables in this program?

Q16. What are the the two variables, first_number and second_number, used for in the program?

Q17. Look at the green operator block, will the program add, subtract, multiply or divide the two numbers?

A number of operators can be combined together to perform more complex operations

x and y are variables in a program.

Variable x is multiplied by 5

10 is subtracted from variable y

The two results are then added together.

Q18. If x = 3 and y = 20, what output will the combination of operators shown above produce?

End of Lesson 5

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