Interview Questions

C Pgm - General Questions

C Programming Interview Questions

General Questions VII

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C Program - General Questions


1.	Define unaligned access and give an example. What would happen 
        if unaligned read/write operation is performed?
	
	a)	Write a macro to check if a given address is aligned or un-aligned.
	b)	Write a function in c that reads unsigned integer from an 
		un-aligned address.

2.	What is the use of double pointer? Write an example C program 
	describing its use?

3.	Write a macro that converts a given integer value to Boolean?

4.	Write a c program to get the offset in bytes of member “x” from the 
	below structure.

		struct abc
		{
		char a;
		short b;
		unsigned c;
		char x;
		long y;
		double z;
		};
	
5.	Write a function to get the value b/w two given bit positions from 
	an integer.

6.	In the below program, in the while loop, how many iterations will 
	it take for while loop to exist?
	
		Unsigned char i;
		while(i<512)
		i++;
		printf(“no of iterations : %d\n”,i);

7.	Imagine there is no definition of NULL in the standard C library.
	How do you define your own NULL macro?
	
8.	Write a program to find if a machine is big endian or little endian.

9.	Wap to find how many 1's having 0 on its right side and 1 on left 
	side (i.e. 110) in given hexadecimal number.
	
10.	Write two function in C( say alloc_no()) should return unique number 
	for every time we call it . Another function (free_no()) should take 
	number as argument and free the allocated number .

	Example :
	
		alloc_no() => 1 // return 1, mark number 1 is allocated
		alloc_no() => 2 // return 2, mark number 2 is allocated
		alloc_no() => 3 // return 3, mark number 3 is allocated
		FREE_NO(2) // MARK NUMBER 2 IS FREE
		alloc_no() => 2 // return 2, mark number 2 is allocated
		alloc_no() => 4 // return 2, mark number 4 is allocated
	
11.	Write a simple c program to demonstrate array of function pointer 
	and calling function in that array dynamically. 
	
12.	Write a c program to show compilation error when changing address 
	and value of a pointer variable which declared as read only address 
	and read only value. 
	
13.	Explain what is SIGSEGV and SIGBUS in Linux and their differences? 
	Write two separate c programs for Linux platform which would throw 
	these signals.
	
14.	You are given set of numbers from 1 to n (except which is a duplicate) 
	in a SLL in scattered order (not in sequence). How do you write a 
	program to find the duplicate number? Explain what the other 
	methods Are to solve and its pros/cons.
	
15.	Why a Microsoft window is not RTOS? What functionality would you add 
	to MICROSOFT OS to make it a RTOS?
	
16.	What is the difference between the static global variable and global 
	variable?
	
17.	Write a program menu based program to set a bit and clear a bit?

18.	Write a program to arrange given array so that all ones will come 
	after all zeros.

 		int a[]={1,0,0,1,0,1,0,0,1,1}
 	
 		
PROGRAMS
--------------

1.	Write a c program for simple browser that does the following operations?
		a)	Open a web page.
		b)	Open a link from the page
		c)	Implement the forward, backward and refresh operation

2.	Write a c program to simulate the functions of a vending machine :

	a)	Get the choice of the product.
	b)	Get the money.
	c)	From pre-defined mapping make sure sufficient money is 
		deposited by the customer and dispatch the product or return 
		and throw error if in-sufficient.
	d)	If the product is empty , display it appropriately

3.	Write a c program to handle the traffic signal in a 4-way junction:
	a)	Assume 30 second interval for each direction.
	b)	Assume 5 seconds buffer for yellow signal, and display it before 
		going to step.
	c)	Handle pedestrian crossing situations as well – assume 10 seconds 
		in each direction. ?

4.	Wap to "odd string" in a file.

5.	Reverse string w/o using any temporary buffer.

6.	Wap to sum of four, 100 digits decimal numbers

7.	Write a C Program

		Input= 0x12345678
	 	Output= 0x21436587
	
8.	mirror image
		1 2 3
		4 5 6 
		7 8 9
	Output
		3 2 1
		6 5 4
		9 8 7

9.	Wap to toggle Nth Bit assuming at least 3 bits. Suppose if num is 
	0x00001234 then N is 4

10.	Assume  you  have  a  method  is Substring  which  checks  if  one  
	word  is  a  substring  of  another  Given two strings, s1 and s2, 
	write code to check if s2 is a rotation of s1 using only one call to 
	is Substring (i.e. “waterbottle” is a rotation of “erbottlewat”

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