I need the C++ code for this question, a requirement for this is to not use global variables, so please refrain from doing so.

.P6.6 Magic squares. An n x n matrix that is filled with the numbers 1, 2, 3,..., n' is a magic square if the sum of the elements in each row, in each column, and in the two diagonals is the same value. 163 2 13 5 10 118 9 6 7 12 4 15 14 1