Printing long number to LCD with separators.

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hallo everybody.
i want print long separators "," , ".". example, want show on lcd number 1234567 "1,234.567". how go doing this? much.

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for example, want show on lcd number 1234567 "1,234.567".

how did determine put comma? how did determine put dot?

did either decision depend on dividing 1000?


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