What is the similarity between a structure, union and enumeration?

What is the similarity between a structure, union and enumeration?

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1) What is the output of this C code?

#include <stdio.h>
     void main()
     {
         struct student         {
             int no;
             char name[20];
         };
         struct student s;
         no = 8;
         printf("%d", no);
     }

2) Number of bytes in memory taken by the below structure is

#include <stdio.h>
     struct test     {
         int k;
         char c;
     };

3) Which of the following are themselves a collection of different data types?

4) What is the similarity between a structure, union and enumeration?

5) Can the below code be compiled successfully?

#include <stdio.h>
     struct p     {
         int k;
         char c;
         float f;
     };
     int main()
     {
         struct p x = {.c = 97, .f = 3, .k = 1};
         printf("%f\n", x.f);
     }