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C Interview Questions
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write a program in c to find out the sum of digits of a number.but here is a condition that compiler sums the value from left to right....not right to left..

1 1924

Write a program to maintain student’s record. Record should not be available to any unauthorized user. There are three (3) categories of users. Each user has its own type. It depends upon user’s type that which kind of operations user can perform. Their types and options are mentioned below: 1. Admin (Search Record [by Reg. No or Name], View All Records, Insert New Record, Modify Existing Record) 2. Super Admin (Search Record [by Reg. No or Name], View All Records, Insert New Record, Modify Existing Record, Delete Single Record) 3. Guest (Search Record [by Reg. No or Name], View All Records) When first time program runs, it asks to create accounts. Each user type has only 1 account (which means that there can be maximum 3 accounts). In account creation, following options are required: Login Name: <6-10 alphabets long, should be unique> Password: <6-10 alphabets long, should not display characters when user type> Confirm Password: Account Type: Login Name, Password and Account Type should be stored in a separate file in encrypted form. (Encryption means that actual information should be changed and Decryption means that Encrypted information is changed back to the actual information) If any of the above mentioned requirement(s) does not meet then point out mistake and ask user to specify information again. When Program is launched with already created accounts, it will ask for user name and password to authenticate. On successful authentication, give options according to the user’s type.

1087

main() { int i = 10; printf(" %d %d %d \n", ++i, i++, ++i); }

TCS, Vector,

8 24127

c language interview questions & answer

1085

What is the difference between realloc() and free()

1 2126

int a=20; int b=30; int c=40; printf("%d%d%d"); what will be the output?

CMC,

5 5131

input any 4 digit number and find the difference of all the digits?

Google,

3 2516

Write an algorithm for implementing insertion and deletion operations in a singly linked list using arrays ?

MNC,

2632

What is the purpose of the following code? Is there any problem with the code? void send(int count, short *to, short *from) { /* count > 0 assumed */ register n = (count + 7) / 8; switch (count % 8) { case 0: do { *to = *from++; case 7: *to = *from++; case 6: *to = *from++; case 5: *to = *from++; case 4: *to = *from++; case 3: *to = *from++; case 2: *to = *from++; case 1: *to = *from++; } while (--n > 0); } }

Google,

1361

what is the purpose of the following code, and is there any problem with the code? void fn(long* p1, long* p2) { register int x = *p1; register int y = *p2; x ^= y; y ^= x; x ^= y; *p1 = x; *p2 = y; }

Google,

1 2974

what is the purpose of the code, and is there any problem with the code? int f( int n, int l, int r ) { return (n << l) >> r; }

Google,

2 2201

What is the purpose of the code, and is there any problem with it? unsigned int f( unsigned n ) { return –n & 7; }

Google,

1 2375

what is the purpose of the code, and is there any problem with it. bool f( uint n ) { return (n & (n-1)) == 0; }

Google,

1 2343

what is the purpose of the code, and is there any problem with it. unsigned int v[10]; unsigned int i = 0; while (i < 10) v[i] = i++;

Google,

2 2609

Identify the operators that is not used with pointer a. && b. # c. * d. >>

2 6526


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Un-Answered Questions { C }

Explain why can’t constant values be used to define an array’s initial size?

258


What are the advantages of c language?

268


What is the difference between #include and #include 'file' ?

214


What is an expression?

243


What are the advantages of using Unions?

250






What is the value of a[3] if integer a[] = {5,4,3,2,1}?

263


How can I remove the trailing spaces from a string?

248


Write a program, where i have a grid with many cells, how many paths are possible from one point to other desired points.

242


What is c language in simple words?

207


What is the explanation for prototype function in c?

220


When should the register modifier be used? Does it really help?

221


How many types of sorting are there in c?

213


What is the difference between a string and an array?

273


Why & is used in c?

209


Do you have any idea how to compare array with pointer in c?

208