Find largest among rows,columns and diagonals

Write a program that reads an NxN square matrix M that calculates the sum of the elements in individual rows, individual columns and the two main diagonals. Among these sums, print the largest. Consider the following matrix of order 3x3: 1 10 13 2 14 12 3 9 8 The row sum values are 1+10+13=24, 2+14+12=28 and 3+9+8=20. The column sum values are 1+2+3=6, 10+14+9=33 and 13+12+8=33. The diagonal