What is the source of this error in opensees?

[radmard]

When I run this commands, the output is zero!

set NstepGravity 10;
set DGravity [expr 1/$NstepGravity];
puts $DGravity;

to correct this (after an hour try and error!!!), I used 1. instead of 1, and the problem solved:

set NstepGravity 10;
set DGravity [expr 1./$NstepGravity];
puts $DGravity;

Why!?? Does any one knows about this role in TCL programming? Shall we always use (.) after integer numbers??

[fmk]

it is integer math .. there have been many posts about it on the board .. always put a . after the number if it is double precision and you want to be safe when it comes to using the variable later in the script in mathematical expressions.