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Structure within another structure (Nested Structure) in C programming

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     One structure can be nested within another structure in C. Let us consider an structure mark which has members subject and marks. This can be nested within another structure student. This can be done as follow.
   struct mark{
               char subject[20];
               float marks;
                };
This structure can be nested within another structure as its member.
  struct student {
            char name[20];
            int roll;
            struct mark studentM;
            char remark;
             }s;
Here, structure student contains a member studentM which is itself a structure with two members. The members within structure mark are accessed as
                   s.studentM.subject and s.studentM.marks
But the members within student structure are accessed as usual
         s.name, s.roll and s.remark
The above nested structure can be nested in alternative way.
            
struct student {
            char name[20];
            int roll;
            char remark;
            struct mark{
               char subject[20];
               float marks;
                }studentM;
 }s;

   Example:
         Create a structure named mark that has subject and marks as its members. Include this structure as a member for student structure created in program1. Use this structure to read and display student’s name, roll, subject, marks and remarks.
void main()
  {
  struct mark{
               char subject[20];
               float marks;
                };
  struct student {
            char name[20];
            int roll;
            struct mark studentM;
            char remark;
             };
    struct student s;
      printf("Enter name:\t");
      scanf("%s",s.name);
      printf("\nEnter roll:\t");
      scanf("%d",&s.roll);
      printf("\nEnter Subject Name:\t");
      scanf("%s",s.studentM.subject);
      printf("\n Enter marks\t");
     scanf("%f",&s.studentM.marks);
     printf("Enter remark p for pass or f for fail\t");
     s.remark=getche();
    printf("\n\n\nThe Detail Information is\n");
printf("\Name=%s\tRoll=%d\nSubject=%s\tMarks=%f\nRemark=%c",s.name,
                                 s.roll,s.studentM.subject,s.studentM.marks,s.remark);
  getch();
  }


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