C Interview Questions
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Create a registration form application by taking the details like username, address, phone number, email with password and confirm password (should be same as password).Ensure that the password is of 8 characters with only numbers and alphabets. Take such details for 3 users and display the details. While taking input password must appear as “****”.

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Question 1: You want to conduct a survey within your classroom, on the quality of canteen’s food. You ask each of your class fellows to rank the quality of food between 1 and 5 (1 representing excellent quality and 5 representing worst quality). During the survey, you make a list containing the roll# of student and the opinion given by that student. The list can be as follow Roll # Opinion 234 1 235 1 236 5 237 1 238 2 239 3 240 5 241 5 242 1 To get the results of the survey, you need to determine the frequency of each opinion value. The frequency of an opinion is determined by counting the number of students giving that opinion. For example, for the above list the frequency of opinion value 1 is 4 and frequency of opinion value 4 is 0. After getting the frequency of each opinion, you can easily judge about the quality of the food by seeing through the frequency of each opinion. You need to develop a program to calculate the results of this survey. The program inputs the opinion of 50 students and counts the frequency of each opinion. It then displays a report showing the frequency of each opinion. Sample output: Opinion Frequency Remarks 1 5 Excellent 2 10 Good 3 15 Normal 4 10 Bad 5 10 Really bad

1 3682

write a c program to calculate sum of digits till it reduces to a single digit using recursion

IBM,

2709

how to build a exercise findig min number of e heap with list imlemented?

1599

. A database table called PERSON contains the fields NAME, BASIC and HRA. Write a computer program to print a report which employee name and total salary for those employees whose total salary is more than 10,000. Total Salary = BASIC + HRA. At the end, the program should also print the total number of employees whose total salary is more than 10,000.

1 5568

Write a c program to print the even numbers followed by odd numbers in an array without using additional array

Tech Mahindra,

1 2933

Just came across this question, felt worth sharing, so here it is I want you to make a C/C++ program that for any positive integer n will print all the positive integers from 1 up to it and then back again! Let's say n=5 I want the program to print: 1 2 3 4 5 4 3 2 1. Too easy you say? Okay then... You can ONLY USE: 1 for loop 1 printf/cout statement 2 integers( i and n) and as many operations you want. NO if statements, NO ternary operators, NO tables, NO pointers, NO functions!

1 2818

write a program in c to read array check element is present or not?

1 3423

How to write a program to receive an integer & find its octal equivalent by using for loop?

Google,

1 3630

main() { int x, arr[8]={11,22,33,44,55,66,77,88}; x=(arr+2)[3]; printf(“%d”,x); }

Vector,

8 19177

struct tag{ auto int x; static int y; };main() { struct tag s; s.x=4; s.y=5; printf(“%d”,s.x); }

Vector,

2 12223

main() { struct test { char c; int i; char m; } t1; printf("%d %d\n", sizeof(t1), sizeof(t1.c)); }

Vector, Vector India,

1 8782

main() { unsigned int k = 987 , i = 0; char trans[10]; do { trans[i++] =(char) (k%16 > 9 ? k%16 - 10 + 'a' : '\0' ); } while(k /= 16); printf("%s\n", trans); }

Vector,

4 12245

main() { FILE *fs; char c[10]; fs = fopen(“source.txt”, ”r”); /* source.txt exists and contains “Vector Institute” */ fseek(fs,0,SEEK_END); fseek(fs,-3L,SEEK_CUR); fgets(c,5,fs); puts(c); }

Vector,

1 9191

main() { char as[] = "\\0\0"; int i = 0; do{ switch( as[i++]) {case '\\' : printf("A"); break; case 0 : printf("B"); break; default : printf("C"); break; }} while(i<3); }

Vector, Vector India,

4 9637


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Un-Answered Questions { C }

Why calloc is better than malloc?

565


What is a program?

648


How can I ensure that integer arithmetic doesnt overflow?

597


Can we change the value of #define in c?

579


How do you convert strings to numbers in C?

699






What is double pointer?

552


What is a good way to implement complex numbers in c?

582


Does * p ++ increment p or what it points to?

601


What is the difference between union and structure in c?

564


Is there anything like an ifdef for typedefs?

694


What is the difference between procedural and functional programming?

511


2) Write a program that will help Air Traffic Control for an airport to view the sequence of flights ready for take-off. The airport can accommodate 10 flights waiting for take-off at any point in time. Each flight has a unique 3 digit numeric identifier.  Each time a flight takes-off, Air Traffic Control adds a flight to the waitlist. Each time a flight is added to the waitlist, the list of flights waiting to take-off must be displayed.  When a flight is cleared for take-off, Air Traffic Control removes the flight from the waitlist. Each time a flight takes-off, the list of flights waiting to take-off must be displayed.  Sequence of take-off is the sequence of addition to the waitlist

2511


Do you know null pointer?

596


What is the maximum no. of arguments that can be given in a command line in C.?

657


What is #include cctype?

570