/*
@author: Rahul Chatterjee
@filename: matrix.c
Diagonal matrix : Every off-diagonal entry is 0

3000
0000
0010
0009

Identity Matrix: Every diagonal entry is 1, all other entries 0

1000
0100
0010
0001

Lower triangular matrix: every super-diagonal entry is 0

3000
1000
2110
0479

Upper triangular matrix: Every sub-diagonal entry is 0

3114
0261
0010
0009

reads from standard input(redirected from input file), an n-by-n matrix, print the type. input file must have positive integer followed by n rows of integers. Exmaple input file contents:

4
3000
1000
2110
0479

then

./matrix <infile

should print

lower triangular matrix



*/