Pointer question with solution IN C programming

(q)What will output :

void main()

{

int * p,b;

b=sizeof(p);

printf(“%d”,b);

}

Output: 2 or 4

Explanation:

Since in this question it has not written p is which type pointer. So it’s output will depends upon which memory model has selected. Default memory model is small.

More detail click here

(q)What will be output ?

void main()

{

int huge *a=(int huge *)0x59990005;

int huge *b=(int huge *)0x59980015;

if(a==b)

printf("power of pointer");

else

printf("power of c");

getch();

}

Output: power of pointer

Explanation:

Here we are performing relational operation between two huge address. So first both a and b will normalize.

a=(0x5999)* (0x10)+(0x0005)=0x9990+0x0005=0x9995

b=(0x5998)* (0x10)+(0x0015)=0x9980+0x0015=0x9995

Here both huge address is representing same physical address. So a==b is true.

read huge pointer click here

(5)What will be output ?

#include

#include

void main()

{

int (*ptr1)();

int (*ptr2)();

void (*ptr3)();

ptr1=puts;

ptr2=getch;

ptr3=clrscr;

(*ptr3)();

(*ptr1)("POWER OF POINTER");

(*ptr2)();

}

Output: POWER OF POINTER

(q) What will be output ?

void main()

{

char *arr[3];

char a=1,b=2,c=3;

arr[0]=&a;

arr[1]=&b;

arr[2]=&c;

clrscr();

printf("%u %u",&b,arr[1]);

printf("\n%d",*arr[2]);

getch();

}

Output :

any addresss same address

3

(q) What will be output ?

#include

#include

void main()

{

char arr[5]={1,2,3,4,5};

char (*ptr)[5];

ptr=&arr;

ptr=(*ptr)+2;

clrscr();

printf("%d",**ptr);

getch();

}

Output: 3

(q) What will be output ?

#include

#include

unsigned long int (* avg())[3]

{

static unsigned long int arr[3]={1,2,3};

return &arr;

}

void main()

{

unsigned long int (*ptr)[3];

ptr=avg();

clrscr();

printf("%d",*(*ptr+2));

getch();

}

Output :3