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For most integers, the short integer type is slightly small, and any
data type larger than int is unnecessarily large. Analogously, for
most floating-point numbers, the float floating-point type is
slightly small, and any data type larger than double is
unnecessarily large. Consequently, most programmers use int and
double more than they do any other integer and floating-point types,
and all the programs in the rest of this book use int and
double for all integers and floating-point numbers. Conveniently, the
%i print specification works for both short and int
integers, and the %f print specification works for both float
and double numbers.