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be used to store multiple types of data. You can use any built-in or user-defined data types
inside a union based on your requirement.
The memory occupied by a union will be large enough to hold the largest member of the
union. For example, in the above example, Data type will occupy
20 bytes of memory space because this is the maximum space which can be occupied by a
character string. The following example displays the total memory size occupied by the above
union:

#include <stdio.h>
#include <string.h>

union Data

{
int i;

float f;
char str[20];

};

int main( )
{

union Data data;

printf( "Memory size occupied by data : %d\n", sizeof(data));

return 0;
}

When the above code is compiled and executed, it produces the following result:

Memory size occupied by data : 20

Accessing Union Members
To access any member of a union, we use the member access operator (.). The member
access operator is coded as a period between the union variable name and the union member that
we wish to access. You would use the keyword union to define variables of union type. The
following example shows how to use unions in a program:

#include <stdio.h>

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