C++ Commands and provide comments please

Write a function add echo that adds an echo to the samples array. Your function should take four parameters the samples array, the size of the samples array the sampling rate (as an int) and the delay d in seconds (as a double), in this order. The function will not return any value. For each sample in the samples array, add the value from d seconds ago. Examples: add echo (15,8,3,10, 6,21,6,1,1) Sampling rate is 1 (meaning 1 sample per second) and the delay is 1 second. For the echo, we need to add the value from 1 second before, which means the previous position. [5, 8, 3, 10, 6, 2] [5, 8+5 3+8 10+3, 6+10, 2+6] [5, 13, 11, 13, 16, 8] add_echo (15, 8,3,10, 6, 21,6, 1, 2) Sampling rate is 1 (meaning 1 sample per second) and the delay is 2 seconds. For the echo, we need to add the value from the 2 seconds ago. Given the sampling rate of 1 sample per second, this means we need to add the value from two positions before ([5, 8, 3, 10, 6, 2] , 6, 1, 2) [5, 8, 3+5 10+8, 6+3, 2+10] [5, 8, 8, 18, 9, 12] add_echo (15, 8,3,10, 6,2],6,2,2) Sampling rate is 2 (meaning 2 samples per second) and the delay is 2 seconds. For the echo, we need to add the value from the 2 seconds ago. Given the sampling rate of 2 samples per second, this means we need to add the value from four positions before ([5, 8, 3, 10, 6, 2] , 6, 2, 2) [5, 8, 3, 10, 6+5,2+8] [5, 8, 3, 10, 11, 10]