Technical interview questions in c

• What does static variable mean? 
• What is a pointer? 
• What is a structure? 
• What are the differences between structures and arrays? 
• In header files whether functions are declared or defined? 
• What are the differences between malloc() and calloc()? 
• What are macros? what are its advantages and disadvantages? 
• Difference between pass by reference and pass by value? 
• What is static identifier? 
• Where are the auto variables stored? 
• Where does global, static, local, register variables, free memory and C Program instructions get stored? 
• Difference between arrays and linked list? 
• What are enumerations? 
• Describe about storage allocation and scope of global, extern, static, local and register variables? 
• What are register variables? What are the advantage of using register variables? 
• What is the use of typedef? 
• Can we specify variable field width in a scanf() format string? If possible how? 
• Out of fgets() and gets() which function is safe to use and why? 
• Difference between strdup and strcpy? 
• What is recursion? 
• Differentiate between a for loop and a while loop? What are it uses? 
• What are the different storage classes in C? 
• Write down the equivalent pointer expression for referring the same element a[i][j][k][l]? 
• What is difference between Structure and Unions? 
• What the advantages of using Unions? 
• What are the advantages of using pointers in a program? 
• What is the difference between Strings and Arrays? 
• In a header file whether functions are declared or defined? 
• What is a far pointer? where we use it? 
• How will you declare an array of three function pointers where each function receives two ints and returns a float? 
• what is a NULL Pointer? Whether it is same as an uninitialized pointer? 
• What is a NULL Macro? What is the difference between a NULL Pointer and a NULL Macro? 
• What does the error 'Null Pointer Assignment' mean and what causes this error? 
• What is near, far and huge pointers? How many bytes are occupied by them? 
• How would you obtain segment and offset addresses from a far address of a memory location? 
• Are the expressions arr and &arr same for an array of integers? 
• Does mentioning the array name gives the base address in all the contexts? 
• Explain one method to process an entire string as one unit? 
• What is the similarity between a Structure, Union and enumeration? 
• Can a Structure contain a Pointer to itself? 
• How can we check whether the contents of two structure variables are same or not? 
• How are Structure passing and returning implemented by the complier? 
• How can we read/write Structures from/to data files? 
• What is the difference between an enumeration and a set of pre-processor # defines? 
• what do the 'c' and 'v' in argc and argv stand for? 
• Are the variables argc and argv are local to main? 
• What is the maximum combined length of command line arguments including the space between adjacent arguments? 
• If we want that any wildcard characters in the command line arguments should be appropriately expanded, are we required to make any special provision? If yes, which? 
• Does there exist any way to make the command line arguments available to other functions without passing them as arguments to the function? 
• What are bit fields? What is the use of bit fields in a Structure declaration? 
• To which numbering system can the binary number 1101100100111100 be easily converted to? 
• Which bit wise operator is suitable for checking whether a particular bit is on or off? 
• Which bit wise operator is suitable for turning off a particular bit in a number? 
• Which bit wise operator is suitable for putting on a particular bit in a number? 
• Which bit wise operator is suitable for checking whether a particular bit is on or off? 
• which one is equivalent to multiplying by 2:Left shifting a number by 1 or Left shifting an unsigned int or char by 1? 
• Write a program to compare two strings without using the strcmp() function. 
• Write a program to concatenate two strings. 
• Write a program to interchange 2 variables without using the third one. 
• Write programs for String Reversal & Palindrome check 
• Write a program to find the Factorial of a number 
• Write a program to generate the Fibinocci Series 
• Write a program which employs Recursion 
• Write a program which uses Command Line Arguments 
• Write a program which uses functions like strcmp(), strcpy()? etc 
• What are the advantages of using typedef in a program? 
• How would you dynamically allocate a one-dimensional and two-dimensional array of integers? 
• How can you increase the size of a dynamically allocated array? 
• How can you increase the size of a statically allocated array? 
• When reallocating memory if any other pointers point into the same piece of memory do you have to readjust these other pointers or do they get readjusted automatically? 
• Which function should be used to free the memory allocated by calloc()? 
• How much maximum can you allocate in a single call to malloc()? 
• Can you dynamically allocate arrays in expanded memory? 
• What is object file? How can you access object file? 
• Which header file should you include if you are to develop a function which can accept variable number of arguments? 
• Can you write a function similar to printf()? 
• How can a called function determine the number of arguments that have been passed to it? 
• Can there be at least some solution to determine the number of arguments passed to a variable argument list function? 
• How do you declare the following: 
• An array of three pointers to chars 
• An array of three char pointers 
• A pointer to array of three chars 
• A pointer to function which receives an int pointer and returns a float pointer 
• A pointer to a function which receives nothing and returns nothing 
• What do the functions atoi(), itoa() and gcvt() do? 
• Does there exist any other function which can be used to convert an integer or a float to a string? 
• How would you use qsort() function to sort an array of structures? 
• How would you use qsort() function to sort the name stored in an array of pointers to string? 
• How would you use bsearch() function to search a name stored in array of pointers to string? 
• How would you use the functions sin(), pow(), sqrt()? 
• How would you use the functions memcpy(), memset(), memmove()? 
• How would you use the functions fseek(), freed(), fwrite() and ftell()? 
• How would you obtain the current time and difference between two times? 
• How would you use the functions randomize() and random()? 
• How would you implement a substr() function that extracts a sub string from a given string? 
• What is the difference between the functions rand(), random(), srand() and randomize()? 
• What is the difference between the functions memmove() and memcpy()? 
• How do you print a string on the printer? 
• Can you use the function fprintf() to display the output on the screen?

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