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Data Type

Data Type. popo. Data Type. A data type defines a set of values that a variable can store along with a set of operations that can be performed on that variable . Common data types are integer, character, and real. popo. Data Type. Data Types. popo. Data Type. popo. Data Type.

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Data Type

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  1. Data Type popo

  2. Data Type • A data type defines a set of values that a variable can store along with a set of operations that can be performed on that variable. • Common data types are integer, character, and real. • popo

  3. Data Type • Data Types • popo

  4. Data Type • popo

  5. Data Type • Basic Data type(Primary, fundamental) • Integers, Character and Floating point • popo

  6. Data Type • Basic Data type(Primary, fundamental) • Integers • Signed and unsigned types • Signed– can store + and –ve integers • Unsigned– can store only +ve integers • popo

  7. Data Type • Basic Data type(Primary, fundamental) • Signed type integers • int:- integers are whole numbers, capable to storing numeric value without decimal places. • any number in the range -32768 to 32767 • It occupies 2 bytes of memory • Long int :- required 4 bytes of memory. • Value range from -2147483648 to 2147483647 • Long int variable can declare • long inta,b; or long a; • popo

  8. Data Type • Basic Data type(Primary, fundamental) • Signed type integers • Short integers :-need less space in memory (same as int) • Short int variable can delare • short int a; or int a;( both are same) • popo

  9. Data Type • Basic Data type(Primary, fundamental) • Unsigned integers • unsigned integers :-some time if we know in advanced, the value stored in an integer variable is always be +ve. • Such situations we can declared the variable as unsigned int • The range permissible integer value will shift from 0 to 65535 ie double the size of int • Unsigned integer variable can declare • unsigned int a; or unsigned a;( both are same)

  10. Data Type • Basic Data type(Primary, fundamental) • Unsigned integers • unsigned short integers :-same as unsigned int • unsigned long integers :- • Range 0 to 42949672954 (double size of long int) • Unsigned long integer variable can declare • unsigned long int a; • popo

  11. Data Type • Basic Data type(Primary, fundamental) • Characters • Signed and unsigned types • Both occupy 1 byte of memory • But having different range • Signed char is same as ordinary char and has range -128 to 127 • Unsigned char range from 0 to 255 • Example • cnsigned char a; • char a; • popo

  12. Data Type • Basic Data type(Primary, fundamental) • Floating point • A float variable occupy 4 bytes of memory • Range from 3.4E-38 to 3.4E+38 • Double occupy 8 bytes of memory • Range from 1.7E-308 to 1.7E+308 • Long double occupy 10 bytes of memory • Range from 3.4E-4932 to 3.4E+4932 • popo

  13. Data Type • popo

  14. Data Type • User Defined Data Type • Type Definition • Enumerated datatype • Structure • Union • popo

  15. Data Type • User Defined Data Type • Type Definition • Allows user to define an identifier that would represent an existing data type • This identifier can later used to declared variables • syntax:-- • Eg: typedefintinteget; • integer a; • popo

  16. Data Type • User Defined Data Type • Enumerated • Allows user to declare variables can have one value enclosed within braces. • Way of attaching name to numbers • syntax:-- • Eg: enum sex{male,female}; • Then value of male=0 and female=1 • popo

  17. Data Type • User Defined Data Type • Structure • A structure is a collection of one or more variables, possibly of different types, grouped together under a single name • A structure is defined by the keyword struct followed by a set of variables enclosed in braces. • Consider the following structure to represent a person’s details. struct Personnel { char name[100]; intage; double height; }; • The variables name, age and height are called members of the structure type Personnel. • popo

  18. Data Type • User Defined Data Type • Structure • There are two ways to define variables of a particular structure type. • Declare them at the structure definition. struct Personnel { char name[100]; intage; double height; } p1, p2, p3; /* Define 3 variables */ • Define the variables at some point after the structure definition. • struct Personnel p1, p2, p3; /* Define 3 variables */ • popo

  19. Data Type • User Defined Data Type • Union • A union is a collection of one or more variables, possibly of different types, grouped together under a single name • A union is defined by the keyword union followed by a set of variables enclosed in braces. • Consider the following union to represent a person’s details. union Personnel { char name[100]; intage; double height; }; • The variables name, age and height are called members of the union type Personnel. • popo

  20. Data Type • User Defined Data Type • union • There are two ways to define variables of a particular union type. • Declare them at the union definition. union Personnel { char name[100]; intage; double height; } p1, p2, p3; /* Define 3 variables */ • Define the variables at some point after the union definition. • union Personnel p1, p2, p3; /* Define 3 variables */ • popo

  21. Data Type • Derived datatype • Array… • Functions… • Pointers… • Reference… • popo

  22. Data Type • Empty data type • void • popo

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