Hi Darji,

You need to first understand that a structure and a union are both user-defined datatypes which essentially contains the variables with different datatypes as declared by programmer. In case of union, the memory size that is allocated is equal to the datatype that is of the largest size and then the variables are operated one by one whereas in a structure the memory size allocated is that of one datatype after the other and once one datatype is executed, the memory is then flushed for the allocation of the next datatype.

Now to conclude, yes a structure can be defined within a union.

BEST WISHES!