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Q:

How would you eliminate the warning generated on complaining the following program?

main()

{

  char far *scr;

  scr = 0xB8000000;

  *scr = 'A';

}

Answer

Use the typecast scr = (char far *) 0xB8000000;

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Subject: Programming

Q:

Would the following program compile?

main()

{

    int a = 10, *j;

    void *k;

    J = k = &a;

    J++;

    k++;

   printf ("\n%u %u", j, k);

}

Answer

An error would be reported in the statement k++ since arithmetic on void pointers is not permitted unless the void pointer is appropriately typecasted.

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Subject: Programming

Q:

What would be the output of the following program assuming that the array beigns at location 1002?

main()

{

   int a[3][4] = {

                            1 , 2 , 3 , 4

                            5,  6 , 7, 8

                            9, 10 , 11, 12

                       };

    Printf ("\n%u %u %u", a[0] + 1, *( a[0] + 1), *( *(a + 0) + 1) );

}

Answer

1004  2  2

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Subject: Programming

Q:

Indicate what would the SWAP macro be expanded to on preprocessing. Would the code compile?

#define SWAP (a, b, c ) (c t; t = a, a = b, b = t; )

main()

{

    int x = 10, y = 20;

    SWAP (x, y, int );

    printf ( " %d%d ", x, y);

}

Answer

( int t ; t = a, a = b, b = t ;);


This code won't compile since declaration of t cannot occur within parentheses.


 

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Subject: Programming

Q:

What would be the output of the following program?

# define SQR(x) (x * x)

main()

{

    int a, b = 3;

    a = SQR ( b + 2 );

    Printf ("\n %d ", a );

}

Answer

11


Because, on preprocessing the expression becomes  a = ( 3 + 2 * 2 + 3),  as Ist preference is multiply & then addition, it evalvates as(3+ 2 * 3 +2) = (3+6+2)=11.

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Subject: Programming

Q:

How many times the following program would print 'Jamboree'?

main()

{

     printf ( "\nJamboree");

     main ();

}

Answer

Till the stack doesn't overflow

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Subject: Programming

Q:

Will the following function work?

f1 ( int a, int b )

{

    return ( f2 (20) );

}

f2 ( int a )

{

    return ( a * a );

}

Answer

Yes

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Subject: Programming

Q:

Point out the error, if any, in the following program.

main()

{

    int a = 10;

    void f();

    a = f();

    printf ( "\n %d", a );

}

void f()

{

    printf ( "\n Hi ");

}

Answer

In spite of defining the function f() as returning void, the program is trying to collect the value returned by f() in the variable a.

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Subject: Programming