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double type

 
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This is from K&B book. I don't know why option 4 '42e7' is a double. Can someone explain this? Thanks
 
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Because the "e7" means "10 to the power 7". So the number 47e7 means 42.0 times 10000000 or 420000000.0. The number 47e7 is therefore considered to be a literal double constant.
 
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