A frequent reader of this site sent this in. No answers, but a nice set of questions. Consider getting Kernighan and Ritchie title if you find many things puzzling here.

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 the 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
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. The same for Palindrome check.
Write a program to find the Factorial of a number.
Write a program to generate the Fibonacci 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