C Interview Questions
Questions Answers Views Company eMail

what is output of the following statetment?Printf(“%x”, -1<<4); ?

5 5015

will the program compile? int i; scanf(“%d”,i); printf(“%d”,i);

3 2265

write a string copy function routine?

2 2556




swap two integer variables without using a third temporary variable?

Persistent,

6 5092

how do you redirect stdout value from a program to a file?

1 1781

write a program that finds the factorial of a number using recursion?

Infosys, TATA,

13 23920

write a “Hello World” program in “c” without using a semicolon?

TCS, Wipro, CTS,

9 8049

Give a method to count the number of ones in a 32 bit number?

4 2337




write a program that print itself even if the source file is deleted?

2 4991

Given an unsigned integer, find if the number is power of 2?

5 4434

what is the difference between these initializations? Char a[]=”string”; Char *p=”literal”; Does *p++ increment p, or what it points to?

4 3954

differentiate between const char *a; char *const a; and char const *a;

TCS, HCL, College School Exams Tests,

2 4717

Why cann't whole array can be passed to function as value.

1 1999

Given a single Linked list with lakhs of nodes and length unknown how do you optimally delete the nth element from the list?

Oracle,

1 2640

What is the relation between # and include

HCL,

5 4784


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Un-Answered Questions { C }

Technical Ability Test: This was difficult. three questions to be attempted in 60 min. The Coplete Technical Paper was as follows: Write the Pseudo code for the following: 1. Wrie a function which returns the most frequent number in a list of integers. Handle the case of more than one number which meets this criterion. public static int[] GetFrequency(int[] list) 2. Counting in Lojban, an artificial language developed over the last fourty years, is easier than in most languages The numbers from zero to nine are: 0 no 1 pa 2 re 3 ci 4 vo 5 mk 6 xa 7 ze 8 bi 9 so Larger numbers are created by gluing the digit togather. For Examle 123 is pareci Write a program that reads in a lojban string(representing a no less than or equal to 1,000,000) and output it in numbers. 3. Where now stands that small knot of villages known as the Endians, a mighty forest once stood. Indeed, legand has it that you could have stoodon the edge of the wood and seen it stretch out for miles, were it not for the trees getting in the way. In one section of the forest, the trees stood in a row and were of hight from 1 to n, each hight occurring once and once only. A tree was only visible if there were no higher trees before it in the row. For example, if the heights were 324165, the only visible trees would have been those of height 3,4 & 6. Write a Program that takes an array of integers representing the heights of the trees in the row as input and prints the list of the visible trees. //////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////// ////////////////// Ques1: Given an array containing k nos in the range 1..n and another scratch array of size n. Write an program to remove the duplicates from the array. Ques2: Given a table of the form: Product Sold on A 1/1/1980 B 1/1/1980 C 1/1/1980 A 1/1/1980 B 1/1/1980 C 2/1/1980 A 2/1/1980 There are 30 products and 10,000 records of such type. Also the month period during which sales happened is given to u. Write the program to display the result as: Product Month No. of copies A January 12 A February 15 A March 27 B January 54 B February 15 B March 10 C January 37 Ques3: Definition of priority queue was given. We have to implement the priority queue using array of pointers with the priorities given in the range 1..n. The array could be accessed using the variable top. The list corresponding to the array elements contains the items having the priority as the array index. Adding an item would require changing the value of top if it has higher priority than top. Extracting an item would require deleting the first element from the corresponding queue. The following class was given: Ques4: An array of size 5X5 is given to us. The elements from 1 to 25 are to be inserted in the array, such that starting from a particular position for an element i, the next element i+1can be inserted only at the mentioned positions (u,v), and if these all positions are occupied then it returns giving a count of how many positions have been occupied in the array: //////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////// ////////////////// Example: if the starting element is 1 with the given positions (1,2), then next element 2 can be placed at any one of the positions marked with *. _ _ _ _ _ 1 _ _ _ * _ _ _ _ _ _ _ * _ _ * _ _ _ _ 2. Four questions of programming in c++, questions were:( 1:30 hr) a) Bubble sort through recursion b) Display Pattern: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 … c) Perform the functionality of 2-D array through 1-D array and in it the functions to be performed were: (1) Display the array in 2-D format (2) Display a particular element (3) Display a particular row (4) Display a particular column d) Give an efficient program for string matching like: Text: this is the code in the text which you have to search by code Pattern: Code Count the no. of occurrences of the pattern to be searched //////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////// ////////////////// a) suppose u r given a 4*3 rectangle like (take these values from user) Now u have to calculate the no. of squares in this rectangle like: No. of squares of dimension 1 is 12 No. of squares of dimension 2 is 6 No. of squares of dimension 3 is 2 No. of squares of dimension 4 is 0 Total no. of squares are 20. b) Suppose u r given a string. U have to find the occurance of the characters A-Z in that string. Each character must appear in the string and must appear only once. If It that occurs in string more than one time return 1 showing it is a perfect string otherwise return 0 showing it is not a perfect string. c) Suppose u r given 10000 marks. U have to pick up top 20 top marks from them and display it on the screen. (Use the optimal sorting algorithm) d) Suppose u have a chess board. U have to insert 8 queens on the chessboard in the style that the queens don’t intersect in the diagonals, columns and rows. If they intersect return 1 else return 0.(that is no more than one queen should be present either in row or column or diagonals.) If the queen is inserted at a position in the chessboard, its count is 1.

2555


a single linked list consists of nodes a to z .print the nodes in reverse order from z to a using recursion

1552


why return type of main is not necessary in linux

937


HOW TO SOLVE A NUMERICAL OF LRU IN OS ??????

1497


if p is a string contained in a string?

684






Write a function stroverlap that takes (at least) two strings, and concatenates them, but does not duplicate any overlap. You only need to worry about overlaps between the end of the first string and the beginning of the second string. Examples: batman, manonthemoon = batmanonthemoon batmmamaman, mamamanonthemoon = batmmamamanonthemoon bat, man = batman batman, batman = batman batman, menonthemoon = batmanmenonthemoon

895


stripos — Find position of first occurrence of a case- insensitive string int stripos ( char* haystack, char* needle, int offset ) Returns the numeric position of the first occurrence of needle in the haystack string. Note that the needle may be a string of one or more characters. If needle is not found, stripos() will return -1. The function should not make use of any C library function calls.

1043


how to solve "unable to open stdio.h and conio.h header files in windows 7 by using Dos-box software

1989


write a C program: To search a file any word which starts with ?a?. If the word following this ?a? starts with a vowel.Then replace this ?a? with ?a? with ?an?. redirect with the output onto an output file.The source file and destination file are specified by the user int the command line.

1707


difference between object file and executable file

4212


a program that can input number of records and can view it again the record

711


how to execute a program using if else condition and the output should enter number and the number is odd only...

861


Is there any algorithm to search a string in link list in the minimum time?(please do not suggest the usual method of traversing the link list)

867


write a c programming using command line argument,demonstrate set operation(eg;union,intersection,difference) example output is c:>setop 12 34 45 1 union 34 42 66 c:>setop 12 34 1 42 66 c:>setop 12 34 diff 12 56 67 78 setop 12 34

844


what is associativity explain what is the precidence for * and & , * and ++ how the folloing declaration work 1) *&p; 2) *p++;

1053