I need help in C++ I have no idea from where to begun tho.

All I have is the instructions and an output of the actual code that's all. Plz Help!!

Objectives: Practice getting input from the user . Practice using loops and conditions Practice using arrays Assignment: Create a program that asks the user for how many sides their shape has and tell them what their shape is based on that. There must be three possible options: 3 (triangle), 4 (quadrilateral), and 5 (pentagon). You should create a corresponding array based on the shape sides. Once the shape is determined, gather the length of all the sides and place them in the array. Once done, total the sides in a loop to determine the perimeter and display that information to the user. Example Execution: How many sides does your shape have? 6 That's not a valid shape here. Try again. How many sides does your shape have? 4 You have a quadrilateral! What is the length of side 1: 3 What is the length of side 2: 0 I'm sorry, that's not a valid length. Try again. What is the length of side 2: 4 What is the length of side 3: 3 What is the length of side 4: 4 Your perimeter is: 14