C++(please add comments)

Problem 2) Extract diagonal elements of a square matrix and put into a column array. Start with matrix of size 4 by 4 below that can be hard coded into your program: 42 65 67 65.54 91.5 3.5 75.7 17 79 84.9 74.3 70.6 95.9 93 39 3.1 And your output display should look like: 42 3.5 74.3 3.1 Test your code with random numbers. Numbers are defined as double variable