I am having trouble figuring out how to solve this problem, it is not in my book I need to write the c++ code and pseudocodes for this problem below.

Sum of all even positive numbers using while loop

Declare number as integer= -1

Declare sum as integer = 0

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Prompt the user to enter a positive number. If it is even and positive, then add the number to the variable sum. If the user provides a negative or odd number, then DO not add the number to the sum. If the user enters 0, then exit the loop. Print the sum.