Basic of c lang programs

8. Program

#include 

#include 

int main ()

{

   int  var = 20;   

   int  *ip;        

   ip = &var;  

   printf("Address of var variable: %x\n", &var  );

   printf("Address stored in ip variable: %x\n", ip );

      printf("Value of *ip variable: %d\n", *ip );

   return 0;

   getch();

}

Output

Address of var variable: bffd8b3c

Address stored in ip variable: bffd8b3c

Value of *ip variable: 20

9. Program

#include 

#include 

int main ()

{

   int  *ptr = NULL;

   printf("The value of ptr is : %x\n", ptr  );

   return 0;

 getch();

}

Output

               The value of ptr is 0

10. Program

#include 

#include 

#include 

int main ()

{

   char str1[12] = "Hello";

   char str2[12] = "World";

   char str3[12];

   int  len ;

   strcpy(str3, str1);

   printf("strcpy( str3, str1) :  %s\n", str3 );

   strcat( str1, str2);

   printf("strcat( str1, str2):   %s\n", str1 );

   len = strlen(str1);

   printf("strlen(str1) :  %d\n", len );

   return 0;

   getch();

}

Output

strcpy( str3, str1) :  Hello

strcat( str1, str2):   HelloWorld

strlen(str1) :  10

11. Program

#include 

#include 

#include 

struct Books

{

   char  title[50];

   char  author[50];

   char  subject[100];

   int   book_id;

};

            void printBook( struct Books *book );

int main( )

{

   struct Books Book1;        

   struct Books Book2;        

   strcpy( Book1.title, "C Programming");

   strcpy( Book1.author, "Nuha Ali"); 

   strcpy( Book1.subject, "C Programming Tutorial");

   Book1.book_id = 6495407;

   strcpy( Book2.title, "Telecom Billing");

   strcpy( Book2.author, "Zara Ali");

   strcpy( Book2.subject, "Telecom Billing Tutorial");

   Book2.book_id = 6495700;

   printBook( &Book1 );

   printBook( &Book2 );

   return 0;

   getch();

}

void printBook( struct Books *book )

{

   printf( "Book title : %s\n", book->title);

   printf( "Book author : %s\n", book->author);

   printf( "Book subject : %s\n", book->subject);

   printf( "Book book_id : %d\n", book->book_id);

 getch();

}

Output

                        Book title : C Programming

Book author : Nuha Ali

Book subject : C Programming Tutorial

Book book_id : 6495407

Book title : Telecom Billing

Book author : Zara Ali

Book subject : Telecom Billing Tutorial

Book book_id : 6495700