Tripti Tiwari
What are the advantages of unions?
By Tripti Tiwari in C, C++, MFC on Oct 04 2013
  • Rahul Prajapat
    Jun, 2015 10

    The basic advantage is that union will use the memory space of the datatype which has the highest memory.... hence memory consumption will be less...But when u use structure the total memory will be the sum of the memory of all datatypes.. ie.(higher memory allocation)Disadvantage is that..... when you use the union.... only the last entered variable can be directly accessed as only the last added data to the union will exist in the memory.

    • 1
  • Munesh Sharma
    Feb, 2015 14

    The basic advantage is that union will use the memory space of the datatype which has the highest memory.... hence memory consumption will be less...But when u use structure the total memory will be the sum of the memory of all datatypes.. ie.(higher memory allocation)Disadvantage is that..... when you use the union.... only the last entered variable can be directly accessed as only the last added data to the union will exist in the memory...

    • 0
  • Rupesh Kahane
    Jun, 2014 17

    1) occupy less memory 2) Convert one datatype to another Consider examples, Suppose we are developing a application for calulator then we will save our data into byte format.Another example is graphics library in C language

    • 0
  • Tripti Tiwari
    Oct, 2013 4

    Union is a collection of data items of different data types. It can hold data of only one member at a time though it
    has members of different data types. If a union has two members of different data types, they are allocated the
    same memory. The memory allocated is equal to maximum size of the members. The data is interpreted in bytes
    depending on which member is being accessed.
    Example:
    union pen {
    char name;
    float point;
    };
    Here name and point are union members. Out of these two variables, 'point' is larger variable which is of float
    data type and it would need 4 bytes of memory. Therefore 4 bytes space is allocated for both the variables. Both
    the variables have the same memory location. They are accessed according to their type. Union is efficient when
    members of it are not required to be accessed at the same time.

    • 0

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