Non zero output from LM358 even though input is zero

Arbitrage said:

The issue is when I test the comparator individually ,it works fine, i.e it will give output only when noninverting is greater than inverterting

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What does this mean?

When a comparator is powered, it will always have an output (assuming it's functional). When the difference between the non-inverting input and inverting input is positive, the output will be HIGH. When the difference is negative, the output will be LOW. Results when the inputs are the same or the difference between them is changing slowly, the output is indeterminate. But there is always output.