Hello and compare two cells question

Hello. First time poster; wish I would've known about this forum years ago.

Here's what I want excel to do, but don't know the formula:

I need excel 2007 to compare two cells; temperature in this case. If cell two is within 3 degress of cell one, then the result should equal 1 (arbitrary number to state that the temperature was in tolerance), if cell two is 4 degrees or greater than cell one, plus or minus, then the result should be 0 (to show temperature outside of tolerance).

Thank you.

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cell one in column a and cell 2 in column b. The sample is for row 3 so it can be copied downward.

It works! Thank you, and reputation added.

you are most welcome, just marked as solved