#Basic data types in c with examples how to#
#Basic data types in c with examples code#

The key/value pairs can be accessed using 'dot' notation.ДЄ hash which preserves the order of the key/value pairs. The data types and values can be changed.ДЄ hash whose keys are case-insensitive strings that must be valid variable names. The key can be of any scalar type, and the value can be of any type. The individual values can be of any data type, and the data types and values can be changed.ДЄ compound data type that contains a reference to a collection of key-value pairs. Object instances can contain data of any type, but the data types allowed are defined by the object class and cannot be changed after creation.ДЄ compound data type that contains a reference to a collection of values. The data type of the value referred to can be changed.ДЄ compound data type that contains a reference to an instance of an IDL object class.

S = s = Create_Struct( 'tag1', 0.0, 'tag2', 'hello')ДЄ compound data type that contains a reference to a single value, where the value can be of any data type. Once a structure is created, neither the tags nor the data types of the values associated with the tags can be changed. LВ = 'Hello' lВ = STRING()ДЄ compound data type that contains pairs of tags and values, where the values can be of any data type.

JВ = COMPLEX( 1.0, 0.0) jВ = COMPLEX( 1, 0)ДЄ real-imaginary pair of double-precision, floating-point numbers.ДЄ sequence of characters, from 0 to 2В 147В 483В 647 (2.1 GB) characters in length, which is interpreted as text. Complex numbers are useful for signal processing and frequency domain filtering. вЂ“9В 223В 372В 036В 854В 775В 808 to +9В 223В 372В 036В 854В 775В 807.ДЄ 64-bit unsigned integer ranging in value from 0 to 18В 446В 744В 073В 709В 551В 615.ДЄ 32-bit, single-precision, floating-point number in the range of в‘0 38, with approximately six or seven significant digits.ДЄ 64-bit, double-precision, floating-point number in the range of в‘0 308 with approximately 15 or 16 significant digits.ДЄ real-imaginary pair of single-precision, floating-point numbers. Pixels in images are commonly represented as byte data.ДЄ 16-bit short signed integer ranging from вЂ“32,768 to +32,767.ДЄ 16-bit short unsigned integer ranging from 0 to 65535.ДЄ 32-bit long signed integer ranging in value fromДЄ 32-bit long unsigned integer ranging in value from 0 to 4В 294В 967В 295.ДЄ 64-bit signed integer ranging in value from !NULLВ may be used for array concatenation, array indexing, and for comparison.ДЄn 8-bit unsigned integer ranging in value from 0 to 255. Type names shown in the Type Name column correspond to the string returned by the TYPENAME function.ДЄn undefined variable.

#Basic data types in c with examples code#

Type codes shown in the Type Code column correspond to the type code returned by the SIZE function.

#Basic data types in c with examples how to#

The following table lists IDL's data types, provides examples of how to explicitly create a variable of each type, and list the routines used to create variables and arrays of each type.

See Compound Data Types for additional information.ДЇinally, there is the special !NULL system variable, which represents an undefined variable. You cannot create a constant of a compound data type, but it is generally possible to create an вЂњemptyвЂќ variable of a compound data type. Examples of compound data types include pointers, structures, objects, lists, and hashes. In addition, IDL provides several compound data types that serve as containers for variables of other data types. IDL's basic data types are discussed in more detail beginning with Defining and Using Constants. The data type assigned to a variable is determined either by the syntax used when creating the variable, or as a result of some operation that changes the type of the variable. In IDL there are twelve basic, atomic data types, each with its own form of constant.