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An Introduction to the PL/CV2 Programming Logic by R. L. Constable

By R. L. Constable

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Other integer types that are available in IDL are described in the IDL documentation. Type BYTE INT LONG LONG64 Bits Bytes 8 16 32 64 1 2 4 8 Range (powers of 2) Minimum Maximum 0 −215 −231 −263 28 − 1 215 − 1 231 − 1 263 − 1 Range (powers of 10) Minimum Maximum 0 −32,768 ∼ −2 · 109 ∼ −9 · 1018 255 32,767 ∼ 2 · 109 ∼ 9 · 1018 Chapter 5 48 Integer Constants and Variables 32/33 33/33 33/32 −33/32 3. Assume that you want to keep track of time using units of seconds. How many years can you count before a LONG variable is unable to represent the elapsed time?

One answer is that floating-point types have their own limitations, as will be discussed in Chapter 6. 9 Exercises Unless otherwise indicated, do the following problems first without using IDL. Then, use IDL to check your answer. 1. What is the binary representation of 17? ) 2. What is the (decimal) result of the following numerical operations? 3 Commonly used integer types. Other integer types that are available in IDL are described in the IDL documentation. Type BYTE INT LONG LONG64 Bits Bytes 8 16 32 64 1 2 4 8 Range (powers of 2) Minimum Maximum 0 −215 −231 −263 28 − 1 215 − 1 231 − 1 263 − 1 Range (powers of 10) Minimum Maximum 0 −32,768 ∼ −2 · 109 ∼ −9 · 1018 255 32,767 ∼ 2 · 109 ∼ 9 · 1018 Chapter 5 48 Integer Constants and Variables 32/33 33/33 33/32 −33/32 3.

0/(n−1). IDL automatically creates the floating-point output array x to store the result. 0. They are, however, zero to within the expected precision of a single-precision floating-point number.

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