![]() ![]() The most positive value would be the first bit a 0 and all other bits 1s, yielding 2^(N-1) - 1.The most negative value would be the first bit a 1 and all other bits 0s, yielding negative 2^(N-1).( The real interpretation in the computer is more complicated, but if you think of it this way you will get the right answers.For signed integral types, the leftmost bit can be thought of as representing a negative 2^(N-1).So for example, a 4-bit unsigned integer could range from 0 to 15, and an 8-bit unsigned integer could range from 0 to 255.The range of possible values for an unsigned integer of N bits is from 0 to 2^N - 1.For unsigned integral types, the leftmost bit, known as the most significant bit, represents 2^(N-1), where N is the total number of bits in the data item.In general the nth bit from the right represents 2^(n-1).The next bit represents the number of 8s.The next bit represents the number of 4s.The next bit represents the number of 2s.The right-most bit, known as the least significant bit, represents the number of 1s.The bits of integral types are interpreted as simple powers of two:.Integral data types include all whole numbers, that is numbers not having any fractional component.Data may be converted from one type to another, ( possibly with loss of precision ), either automatically or specifically.Most modern languages also include a number of language-specific special types, and many languages provide a means for programmers to define their own data types, and the operations that can be performed on them. Most modern computer languages recognize five basic categories of data types: Integral, Floating Point, Character, Character String, and composite types, with various specific subtypes defined within each broad category.The "type" of a particular variable or constant determines how many bits are used used for that paticular data item, and how the bits are to be interpreted.Physically these zeros and ones may be implemented using wires with two different voltages, magnetic particles with two different alignments, spots on an optical disk having two different optical properties, or by other means.These binary digits are referred to as "bits".Ultimately all data stored on a computer, both variables and constants, is stored as a sequence of binary digits, e.g.Constants are values that are hard-coded into a program, and which do not chnage value.Variables are named storage locations where data is stored, which may be changed as a program runs.Programming Concepts Course Notes - Data Types
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |