Structure and Union and Memory Allocation

Structure Defination:

            a data type to store group of data with various of data type

Syntax:

struct name_structure {

    dataType1 name_field1;

    dataType2 name_field2;

    …

};

Union Defination:

Union is used for memory join. By using union, a memory location can be assigned for two or more variable with different data types

Syntax:

union  name_union{

     typedata1  name_var1 ;

     typedata2   name_var2;

     ……

} name_var_union;

Union Containing:

 name_union   name_var_union; 

Memory Allocation Defination:

acquiring some memory space (RAM) managed by the OS to be used by a program.

Memory de-allocation Defination

            releasing memory space (RAM) back to the OS.

 Albert TG/2201736385/LB04

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