The two values that i have are:

```
firstval=200.000
Secondval=399.999,
```

I have to generate a numbers such that when the first decimal part should get incremented till `999`

for the integral part, next the integral part should be incremented and then decimal part resets to `000`

and starts incrementing for the new number . And this happens till `399`

.
Like

200.001,200.002.....200.999,201.000,201.002....399.998,399.999"