Pointers - C Questions

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Data Types - C Questions

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Operators - C Questions

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Structures - C Questions

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Files - C Questions

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printf - C Questions

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Variables - C Questions

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Preprocessor Macros

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While Loop - C Questions

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for Loop - C Questions

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if else - C Questions

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Switch case - C Questions

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Array - C Questions

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Functions - C Questions

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Memory Allocation

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C Pointers Tricky Questions and Answers

In most of the MNC interview questions such as in ZOHO interview question, IVTL Infoview interview questions, Amazon interview questions, GOOGLE interview questions, Infosys interview questions and even in Voonik interview questions, We come across several Tricky C Questions about which 2:5 of the questions are from pointers in c. Solving that kind of tricky C questions is not an easy task for all C programmers. We need more practices to solve it with ease. So we provide 25+ interesting C questions in pointers to make your MNC interview very easy.

Pointers Tricky Questions and Answers

21. What will be the output of the C program?

#include<stdio.h>
int main()
{
	char *ptr;
	char string[] = "learn C from 2braces.com";
	ptr = string;
	ptr += 6;
	printf("%s",ptr);
	return 0;
}

A. compilation error

B. Runtime error

C. from 2braces.com

D. C from 2braces.com

x

 

Option: D

Explanation

Each letter in string[] array is stored in seperate address. The starting address in string[] array is stored a pointer variable ptr which is then incremented by 6. Thus "learn " is neglected and "C from 2braces.com" is displayed.

Answer


22. What will be the output of the C program?

#include<stdio.h>
int main()
{
	const int a = 5;
	const int *ptr;
	ptr = &a;
	*ptr = 10;
	printf("%d\n", a);
	return 0;
}

A. Compilation error

B. Garbage Value

C. Address

D. 5

x

 

Option: C

Explanation

Pointer variable *ptr cannot be initialized at any time.

Answer


23. What will be the output of the C program?

#include<stdio.h>
int main()
{
	printf("%d", sizeof(void *));
	return 0;
}

A. 1

B. compilation error

C. Runtime error

D. 4

x

 

Option: D

Explanation

sizeof void is 1 and the sizeof void pointer is 4

Answer


24. What will be the output of the C program?

#include<stdio.h>
void function(char**);
int main()
{
	char *arr[] = { "ant", "bat", "cat", "dog", "egg", "fly" };
	function(arr);
	return 0;
}
void function(char **ptr)
{
	char *ptr1;
	ptr1 = (ptr += sizeof(int))[-2];
	printf("%s\n", ptr1);
}

A. cat

B. bat

C. dog

D. egg

x

 

Option: A

Explanation

Here function() gives the address of first value("ant") in an arr.This address is summationed by a sizeof(int) which is 4. now the address in ptr points the value eggs, which is then reduced by 2 . now it points to the value cat which is finally displayed

Answer


25. What will be the output of the C program?

#include<stdio.h>
int main()
{
	struct node
	{
	int a, b, c;
	};
	struct node num = {3, 5, 6};
	struct node *ptr = & num;
	printf("%d\n", *((int*)ptr + 1 + (3-2)));
	return 0;
}

A. 3

B. 5

C. Compilation error

D. 6

x

 

Option: D

Explanation

Here the pointer variable stores the address of first value in struct node num = {3, 5, 6}; which is incremented by 2 and then the value 6 is finally displayed.

Answer


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