How to start writing assignment?

Question

C++ / C#

The task itself: Enter 2 ordered arrays. Get an ordered array by merging 2 inputs and output it.
How to make one common from 2 arrays and then sort, and most likely using quick sort?

Answer 1

Merge sort

Answer 2

To solve the problem, hit on the subtasks, your question actually already has everything:
1) Entering an array
2) Merging two arrays
3) Quick sorting algorithm
Each of the tasks is easily found in the search engine. It would be nice to have tests that will prove the correctness of solving problems.