What is the main difference between STRUCTURE and UNION?

Answer Posted / vijay nag

All the members of the structure can be accessed at
once,where as in an union only one member can be used at a time.
Another important difference is in the size allocated to a
structure and an union.
for eg:
struct example
{
int integer;
float floating_numbers;
}
the size allocated here is sizeof(int)+sizeof(float);
where as in an union
union example
{
int integer;
float floating_numbers;
}
size allocated is the size of the highest member.
so size is=sizeof(float);

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