Write it in c++ please.

4. An application uses a two-dimensional array defined as follows. int days [5] [5] a. Write code to input all array elements from keyboard. b. Write code that sums each row in the array and displays the results. c. Write code that sums each column in the array and displays the results. d. Write code that sums all elements in the diagonal and displays the results. e. Write code to add 100 to each array element. f. Write code to print all array elements each row in a new line