java <= not working correctly -

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    {         system.out.println("please enter cost: ");         cost1 = input.nextdouble();     } while (cost1 <= 100000 || cost1 >= 900000);

that's code. if enter 100001 skips loop, if put 100000 not. why this?

wrong condition (based on expect it)

cost1 <= 100000 || cost1 >= 900000

means

while cost1 <= 100k or cost1 >=900k

so when put 100001 neither less equal 100k nor greater equal 900k


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