Define a structure called Part containing int variable partNumber and char array partName, whose values may be as long as 25 characters. A18. 019. State the following is true or false. If false, explain why. C++ considers the variables number and NuMbEr to be identical. A19. 020. Write a single C++ statement to accomplish the following. Compute the product of the three integers contained in variables x, y and z, and assign the result to the variable result A20. 021. Write C++ statements to accomplish each of the following tasks. a) Declare variables sum and x to be of type int. b) Set variable x to 1. c) Set variable sum to 0. d) Add variable x to variable sum and assign the result to variable sum. e) Print "The sum is: " followed by the value of variable sum. A21.