Question

Write the definition of a function isPositive, that receives an integer parameter and returns true if the parameter is positive, and false otherwise. So, if the parameter's value is 7 or 803 or 141 the function returns true. But if the parameter's value is -22 or -57, or 0, the function returns false.

Answer 1

BEGIN def function isPositive(int parameter)

//test for positivity

if parameter > 0

RETURN true

else

RETURN false

END def function isPositive

Explanation:

A number is a positive integer if it is a whole number and exists between 0 and positive infinity e. g 1, 90000, 42434234 e.t.c. It is a negative integer if it is a whole number and exists between negative infinity and 0(0 may be inclusive). e.g 0, -34342, -6984.

As shown on the first line, to define a function, we begin by writing the name of the function - "isPositive" in this case - followed by a pair of parenthesis which contains the parameter(s) on which the function will act on. In this case, the parameter is an integer - positive or negative.

Line 2 shows a comment describing what happens on the next four lines. i.e checking whether or not the parameter's value is positive

Then, we write an if-else statement to check whether or not the parameter's value is a positive integer. If the parameter's value is greater than 0, the parameter's value is thus a positive integer then the function will return true. This is shown on lines 3 and 4. Otherwise, the parameter's value is a negative integer, thus the function returns a false as shown on lines 5 and 6.

The last line in the expression shows the end of the function's definition.

Hope it helps.