Structure within Structure in C programming

We have done programs on C structure where structure member are normally primitive data members. Now we will see how to use structure variables as a member of another structure.

#include< stdio.h>

struct cal

{

 int feet;

 float inch;

 };

 struct Room

 {

 struct cal length;

 struct cal width;

 };

 void main()

 {

 struct Room ob;

 float l,w;

    clrscr();

 ob.length.feet=10;

 ob.length.inch=2.5;

 ob.width.feet=10;

 ob.width.inch=2.5;

 l=ob.length.feet+ob.length.inch/12;

 w=ob.width.feet+ob.width.inch/12;

 l=l*w;

 printf("Area of the Room %.2f",l);

  getch();

  }

Another program on structure within structure.

# include< stdio.h>

struct Addr

{

            char street[30];

            char city [30];

            char state[20];

            long  pin;

};

struct Customer

{

            char name[20];

            char account[10];

            char profession[30];

            struct Addr address;

};

void main()

{

   struct Customer *list[100];

   int i, n;

   clrscr();

   printf("\n Input number of record you want to process: ");

   scanf("%d", &n);

   printf("\n Input the information of customer\n");

   for(i=0; i< n; i++)

   {

        fflush(stdin);

       printf("\n Name: ");

       gets(list[i]->name);

       printf("\n Account Number:");

       gets(list[i]->account);

       printf("\n Profession:");

       gets(list[i]->profession);

       printf("\n*** Address***");

       printf("\n**************\n");

       printf("\n Street:");

         gets(list[i]->address. street);

         printf("\n City:");

         gets(list[i]->address. city);

         printf("\n State:");

         gets(list[i]->address. state);

         printf("\n Pin Code:");

         scanf("%ld", &list[i]->address. pin);

         clrscr();

     }

   for(i= 0; i< n; i++)

   {

     printf("\n List of the customer");

     printf("\n ********************\n");

     printf("\n Name: %s", list[i]->name);

     printf("\n Account Number: %s", list[i]->account);

     printf("\n Profession: %s", list[i]->profession);

     printf("\n *** Address ***");

     printf("\n----------------");

     printf("\n Street: %s", list[i]->address. street);

      printf("\n City: %s", list[i]->address. city);

      printf("\n State: %s", list[i]->address. state);

    printf("\n Pin code: %ld", list[i]->address. pin);

    printf("\n*******************");

    printf("\nPress any key...........");

    getch();

     clrscr();

   }

 }