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Q:

How would you check whether the contents of two structure variables are same or not?

Answer

struct emp


{


     char n[20];


      int age;


};


main()


{


    struct emp e1 = {"Dravid", 23};


   struct emp e2;


   scanf ("%s %d",e2.n, & e2.age);


   if( structcmp (e1,e2) ==0)


        printf ("The structures are equal");


   else


         printf ("The structures are unequal");


}


structcmp ( struct emp x, struct emp y)


{


     if (strcmp (x.n,y.n) ==0)


           if (x.age == y.age)


            return (0);


            return (1);


}


In short, if you nee to compare two structures, you'll have to write your own function to do so which carries out the comparison field by field.

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Subject: Programming

Q:

What would be the output of the following program?

main()

{

   struct emp

   {

        char *n;

        int age;

   };

   struct emp e1 = { "Dravid", 23};

   struct emp e2 = e1;

   strupr (e2.n);

   printf ("\n%s",e1.n);

}

Answer

DRAVID


When a structure is assigned, passed, or returned, the copying is done monolithically. This means that the copies of any pointer fields will point to the same place as the original. In other words, anything pointed to is not copied. Hence, on changing the name through e2.n it automatically changed e1.n

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Subject: Programming

Q:

If the following structure is written to a file using fwrite(), can fread() read it back successfully?

struct emp

{

    char *n;

    int age;

};

struct emp e = { "Sujay",15};

FILE *fp;

fwrite (&e, sizeof (e), 1, fp);

Answer

No, since the structure contains a char pointer while writing the structure to the disk using fwrite() only the value stored in the pointer n would get written. When this structure is read back the address would be read back but it is quite unlikely that the desired string would be present at this address in memory

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Subject: Programming

Q:

Point out the error, ifany, in the followingb code?

typedef struct

{

     int data;

     NODEPTR link;

} *NODEPTR;

 

Answer

A typedef defines a new name for a type, and in simpler cases like the one shown below you can define a new structure type and a typedef for it at the same time.


typedef struct


{


    char name[20];


    int age;


} emp;


However, in the structure defined in this question, there is an error because a typedef declaration cannot be used until it is defined. In the given code fragment the typedef declaration is not yet defined at he point where the link field is declared.

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Subject: Programming

Q:

How would you find the length of each string in the following Program?

main()

{

    char *str[] = { "Frogs", "Do", "Not" , "Die" , "They" , "Croak!"};

    printf ("%d%d", sizeof (str), sizeof (str[0]));

}

Answer

main()


{


   char *str[] = { "Frogs", "Do", "Not", "Die." , "They", "Croak!" };


   int i;


         for ( i = 0;i<=5;i++)


         printf ("\n%s%d", str[i], strlen( str[i]));


}

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Subject: Programming

Q:

What would be the output of the following program?

main()

{

     char ch ='A';

      printf ("%d%d", sizeof (ch), sizeof ('A'));

}

Answer

1   2

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Subject: Programming

Q:

What would be the output of the following program, if the array beigns at address 65486?

main()

{

    int arr[] = {12,14,15,23,45};

    printf ("%u %u", arr, &arr);

}

Answer

65486  65486

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Subject: Programming

Q:

What would be the output of the following program?

main()

{

    char a[] = "Visual C++";

    char *b = "Visual C++";

    printf ("\n%d %d", sizeof (a), sizeof (b));

    printf ("\n%d %d", sizeof (*a), sizeof (*b));

} 

Answer

11  2


 1   1

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Subject: Programming