testbench

[whereismelvin]

I wrote a testbench for a 4-bit syn counter.
i initialised a 4-bit variable inp ( declared as inout )to 0 and then
tried to increment it in a loop as
inp=inp + 1; But this statement is creating problems

 

[Tricky]

I wrote a testbench for a 4-bit syn counter.
i initialised a 4-bit variable inp ( declared as inout )to 0 and then
tried to increment it in a loop as
inp=inp + 1;   But this statement is creating problems

Plase post the code that is causing problems.