Endless loop: utility, ending the loop

Sometimes, programmer will intentionally create an endless loop, can you think of an example why? When programmer intentionally creates an endless loop, how will he end the loop?

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... for ever
{
read data from temperature sensor
process data and send it to lcd display board
}

OR

while ( 1 )
{
same loop body as in above example
}

There could be situations where temperature sensor goes bad or interface to it goes ...