C:\Users\x>cd desktop

C:\Users\x\Desktop>inv2.pl

 Enter the Number of Rows i.e. 4 here: 4

 Please type the filename(.txt) i.e. d1.txt: d1.txt

 The contents of input matrix file are (array m2):

$m2[0]=[3,2,1,1];
 $m2[1]=[1,0,2,2];
 $m2[2]=[4,1,3,3];
 $m2[3]=[1,2,3,4];
Illegal division by zero at C:/Perl/lib/math_module.pm line 60, <DNAFILE>line 4.