Testing New - General Knowledge Questions and Answers

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The declaration
int (*p) [5];
means

A.

p is one dimensional array of size 5, of pointers to integers.

B.

p is a pointer to a 5 elements integer array.

C.

The same as int *p[

D.

None of these.

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Comment on the following?
const int *ptr;

A.

We cannot change the value pointed by ptr.

B.

We cannot change the pointer ptr itself.

C.

Both of the above

D.

We can change the pointer as well as the value pointed by it.

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#include<stdio.h>
void main()
{
      int *ptr, a=10;
      ptr = &a;
      *ptr += 1;
      printf("%d, %d", *ptr, a);
}

A.

10, 10

B.

10, 11

C.

11, 10

D.

11, 11

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A function 'p' that accepts a pointer to a character as argument and returns a pointer to an array of integer can be declared as

A.

int(*p(char *))[]

B.

int *p(char *)[]

C.

int (*p) (char *)[]

D.

None of these.

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Answer : Option A

Explanation :

OPTION 'A' AS CORRECT...
THERE ARE SEVERAL DIFFERENT USES OF POINTERS IN C...THEY ARE
(1) int *p;
// p is a pointer to an integer quantity
(2) int *p[10];
// p is a 10-element array of pointers to integer quantities
(3) int (*p)[10];
// p is a pointer to a 10-element integer array
(4) int *p(void);
// p is a function that returns a pointer to an integer quantity
(5) int p(char *a);
// p is a function that accepts an argument which is a pointer to a character returns an integer quantity
(6) int *p(char *a);
// p is a function that accepts an argument which is a pointer to a character returns a pointer to an integer quantity.
(7) int (*p)(char *a);
// p is pointer to a function that accepts an argument which is a pointer to a character returns an integer quantity.
(8) int (*p(char *a))[10];
// p is a function that accepts an argument which is a pointer to a character returns a pointer to a 10-element integer array.
(9) int p(char (*a)[]);
// p is a function that accepts an argument which is a pointer to a character array returns an integer quantity.
(10) int p(char *a[]);
// p is a function that accepts an argument which is a array of pointers to characters returns an integer quantity
(11) int *p(char a[]);
// p is a function that accepts an argument which is a character array returns a pointer to an integer quantity
(12) int *p(char (*a)[]);
// p is a function that accepts an argument which is a pointer to a character array returns a pointer to an integer quantity
(13) int *p(char *a[]);
// p is a function that accepts an argument which is an array of pointers to characters
// returns a pointer to an integer quantity
(14) int (*p)(char (*a)[]);
// p is pointer to a function that accepts an argument which is a pointer to a character array returns an integer quantity
(15) int *(*p)(char (*a)[]);
// p is pointer to a function that accepts an argument which is a pointer to a character array returns a pointer to an integer quantity
(16) int *(*p)(char *a[]);
// p is pointer to a function that accepts an argument which is a array of pointers to characters returns a pointer to an integer quantity
(17) int (*p[10])(void);
// p is 10-element array of pointers to functions; each function returns an integer quantity
(18) int (*p[10])(char a);
// p is 10-element array of pointers to functions; each function accepts an argument which is a character and returns an integer quantity
(19) int *(*p[10])(char a);
// p is 10-element array of pointers to functions; each function accepts an argument which is a character and returns a pointer to an integer quantity
(20) int *(*p[10])(char *a);
// p is 10-element array of pointers to functions; each function accepts an argument which is a pointer to a character and returns a pointer to an integer

What will be printed after compiling and running the following code?

main() 
{ 
    char *p; 
    printf("%d %d",sizeof(*p), sizeof(p));
}

A.

1 1

B.

1 2

C.

2 1

D.

2 2

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What will be the output of the following program code?

#include <stdio.h>
void main()
{
    int i=3, *j, **k;
    j = &i;
    k = &j;
    printf("%d%d%d", *j, **k, *(*k));
}

A.

444

B.

000

C.

333

D.

433

E.

Garbage Value

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Which of the following is the correct way of declaring a float pointer:

A.

float ptr;

B.

float *ptr;

C.

*float ptr;

D.

None of the above

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Find the output of the following program.

void main()
{
   char *msg = "hi";
   printf(msg);
}

A.

hi

B.

h

C.

hi followed by garbage value

D.

Error

E.

Garbage Value

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Find the output of the following program.

void main()
{
   int array[10];
   int *i = &array[2], *j = &array[5];
   int diff = j-i;
   printf("%d", diff);
}

A.

3

B.

6

C.

Garbage value

D.

Error