1.Difference between malloc and calloc
2.Write your own strcpy,strcmp,atoi function
char *my_strcpy(char dest[], const char source[])
{
int i = 0;
while (source[i] != '\0')
{
dest[i] = source[i];
i++;
}
dest[i] = '\0';
return(dest);
}
2.1 Program to Check if a Given String is Palindrome
// A function to check if a string str is palindrome
void isPalindrome(char str[])
{
// Start from leftmost and rightmost corners of str
int l = 0;
int h = strlen(str) - 1;
// Keep comparing characters while they are same
while (h > l)
{
if (str[l++] != str[h--])
{
printf("%s is Not Palindrome\n", str);
return;
}
}
printf("%s is palindrome\n", str);
}
2.2 Program t check if number is palindrome
http://www.geeksforgeeks.org/check-if-a-number-is-palindrome/
3. Write a program to delete a node from Linked List
4.Write a program to reverse a linked List with recursion and w/o recurssion.
5. Program to find the Nth Node from end in single traversal
6.Write a function to accept variable number of arguments
7.different storage classes in c
8.Program to write a daemon in c
9.What is structure padding in C,size of a structire variable.
10. Advantage of function pointers
11.How to find linked list has loop
12.find the middle element of a linked list
13.write a function to check if a string/number is palindrome
14.Difference between reference variable and pointer variable
15.Difference between string a character arrays
16.Constant pointer and pointer to a constant
17.describe memory layout of a c/c++ program.i.e. heap/stack/static storage etc
18.Difference between character array and character pointer
char arr[]="hello";
char *s="hello";
19. memset vs memcpy.
20.What is a dangling pointer.give an example.Example of cases when memory leak might hppen
21.Mutable vs Volatile variables
22.Why is volatile needed in c
23. C Program to Check whether two Strings are Anagrams.(with sort and without sorting them)
24What is stack unwinding,context switching,Segmentation Fault
http://www.bogotobogo.com/cplusplus/stackunwinding.php
http://www.geeksforgeeks.org/stack-unwinding-in-c/
25. Sorting Algorithms along with time complexities- Selection,Insertion,Bubble,Quick,Merge
26.How to use realloc function as free and malloc or inplace of free and malloc
27.Programm or macro for - setting a bit,toggling a bit,clear and checking a bit using bitwise operators
28. Strlen vs sizeof op in c
29. implement strlen function in C
30.Write a program to check whether the given number is a prime.
31.Write a program to generate the Fibonacci series
32.Difference in reading a text file and a Binary file ?
33.Break vs continue
34.Why is it safer to use fgets() over gets()
35.difference between printf ,fprintf,sprintf
36.prorag to check liitle endian vs big endian
37.What is the difference between NULL, '\0' and 0
http://stackoverflow.com/questions/1296843/what-is-the-difference-between-null-0-and-0
38.write a variable argument function
http://www.tutorialspoint.com/cprogramming/c_variable_arguments.htm
40.What does the below codes do ??
a.
void my_strcat(char *dest, char *src)
{
(*dest)? my_strcat(++dest, src): (*dest++ = *src++)? my_strcat(dest, src): 0 ;
}
b.
int my_strcmp(char *a, char *b)
{
return (*a == *b && *b == '\0')? 0 : (*a == *b)? my_strcmp(++a, ++b): 1;
}
41.Dynamically allocate array of strings in c
int num,len,i;
char temp[50],ch;
char **ptr;
printf("enter num of strings u want\n");
scanf("%d",&num);
ptr=(char **)malloc(sizeof(char *) * num);
for(i=0;i <num;i++)
{
printf("enter the string\n");
scanf("%s",temp);
len=strlen(temp)+1;
ptr[i]=(char*)malloc(len);
strcpy(ptr[i],temp);
}
42. Difference between global static variable vs normal global variable
static int var1;
int var2;
int main(){}
var2 has external linkage while var1 has internal linkage (visible to that file only)
43. Multi threading c (pthreads)
44. System programming(IPC) - sockets,sharedmem etc
45. what is the difference between popen() and system() in C ?
46. in C Language,which is better(faster n safer) : Better sprintf ,strcpy or memcpy???
47. How to debug a program running in remote machine ?
gdbserver
48.What will be the output of below code snippet?
int x=0;
while (x<3) {
cout<<x<<std::endl;
x = x++;
}
ANS: Infinite loop
49. What is heap corruption ?
50. which layout the command line arguments stored in memory ? heap , stack or somewhere else ?
51. describe how heap is designed ?
52. socket programming -- Listen socket call
https://stackoverflow.com/questions/60181148/what-is-the-purpose-of-listen-in-socket-programming
https://www.gnu.org/software/libc/manual/html_node/Accepting-Connections.html
53. System calls in c ==>
A system call is a request for service that a program makes of the kernel
System calls are sometimes called kernel calls.
https://www.gnu.org/software/libc/manual/html_node/System-Calls.html
https://www.geeksforgeeks.org/input-output-system-calls-c-create-open-close-read-write/
