HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 59
Calculator objects
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Chapter 2 Introducing the calculator In this chapter we present a number of basic operations of the calculator including the use of the Equation Writer and the manipulation of data objects in the calculator. Study the examples in this chapter to get a good grasp of the capabilities of the calculator for future applications. Calculator objects Any number, expression, character, variable, etc., that can be created and manipulated in the calculator is referred to as an object. Some of the most useful type of objects are listed below. Real. These object represents a number, positive or negative, with 12 significant digits and an exponent ranging from -499 to +499. example of reals are: 1., -5., 56.41564 1.5E45, -555.74E-95 When entering a real number, you can use the V key to enter the exponent and the \ key to change the sign of the exponent or mantissa. Note that real must be entered with a decimal point, even if the number does not have a fractional part. Otherwise the number is taken as an integer number, which is a different calculator objects. Reals behave as you would expect a number to when used in a mathematical operation. Integers. These objects represent integer numbers (numbers without fractional part) and do not have limits (except the memory of the calculator). Example of integers are: 1, 564654112, -413165467354646765465487. Note how these numbers do not have a decimal point. Due to their storage format, integer numbers are always maintain full precision in their calculation. For example, an operation such as 30/14, with integer numbers, will return 15/7 and not 2.142.... To force a real (or floating-point) result, use function NUM ,ï. Integers are used frequently in CAS-based functions as they are designed to keep full precision in their operation.. Page 2-1
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