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For most integers, the byte and short integer types are a little
small, and long is unnecessarily large, so the int data type,
lying between, is popular. For most floating-point numbers, the
float floating-point type is a little small, so the double data
type, being twice as big, is popular. Accordingly, all the programs in the
rest of this book use int for all integers and double for all
floating-point numbers.