What's in C

1. # What is data types in C?
2. # Why C is the first language to teach the students at engineering colleges?
3. # Why in this modern world also C is the backbone of software industry?
4. # still in colleges during on-campus they ask questions mostly from C ?
5. # what is the importance of data structure through C?
6. # When program is run then how it manages the memory location and where it stores the variables,expression's value and all?
7. # What is the difference between declaration and definition?
8. # What does static variable mean?
9. # What is a pointer?
10. # What is a structure?
11. # What are the differences between structures and arrays?
12. # In header files whether functions are declared or defined?
13. # What are the differences between malloc() and calloc()?
14. # What are macros? what are its advantages and disadvantages?
15. # Difference between pass by reference and pass by value?
16. # What is static identifier?
17. # Where are the auto variables stored?
18. # Where does global, static, local, register variables, free memory and C Program instructions get stored?
19. # Difference between arrays and linked list?
20. # What are enumerations?
21. # Describe about storage allocation and scope of global, extern, static, local and register variables?
22. # What are register variables? What are the advantage of using register variables?
23. # What is the use of typedef?
24. # Can we specify variable field width in a scanf() format string? If possible how?
25. # Out of fgets() and gets() which function is safe to use and why?
26. # Difference between strdup and strcpy?
27. # What is recursion?
28. # Differentiate between a for loop and a while loop? What are it uses?
29. # What are the different storage classes in C?
30. # Write down the equivalent pointer expression for referring the same element a[i][j][k][l]?
31. # What is difference between Structure and Unions?
32. # What the advantages of using Unions?
33. # What are the advantages of using pointers in a program?
34. # What is the difference between Strings and Arrays?
35. # In a header file whether functions are declared or defined?
36. # What is a far pointer? where we use it?
37. # How will you declare an array of three function pointers where each function receives two ints and returns a float?
38. # what is a NULL Pointer? Whether it is same as an uninitialized pointer?
39. # What is a NULL Macro? What is the difference between a NULL Pointer and a NULL Macro?
40. # What does the error 'Null Pointer Assignment' mean and what causes this error?
41. # What is near, far and huge pointers? How many bytes are occupied by them?
42. # How would you obtain segment and offset addresses from a far address of a memory location?
43. # Are the expressions arr and &arr same for an array of integers?
44. # Does mentioning the array name gives the base address in all the contexts?
45. # Explain one method to process an entire string as one unit?
46. # What is the similarity between a Structure, Union and enumeration?
47. # Can a Structure contain a Pointer to itself?
48. # How can we check whether the contents of two structure variables are same or not?
49. # How are Structure passing and returning implemented by the complier?
50. # How can we read/write Structures from/to data files?
51. # What is the difference between an enumeration and a set of pre-processor # defines?
52. # what do the 'c' and 'v' in argc and argv stand for?
53. # Are the variables argc and argv are local to main?
54. # What is the maximum combined length of command line arguments including the space between adjacent arguments?
55. # 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?
56. # Does there exist any way to make the command line arguments available to other functions without passing them as arguments to the function?
57. # What are bit fields? What is the use of bit fields in a Structure declaration?
58. # To which numbering system can the binary number 1101100100111100 be easily converted to?
59. # Which bit wise operator is suitable for checking whether a particular bit is on or off?
60. # Which bit wise operator is suitable for turning off a particular bit in a number?
61. # Which bit wise operator is suitable for putting on a particular bit in a number?
62. # Which bit wise operator is suitable for checking whether a particular bit is on or off?
63. # which one is equivalent to multiplying by 2:Left shifting a number by 1 or Left shifting an unsigned int or char by 1?
64. # Write a program to compare two strings without using the strcmp() function.
65. # Write a program to concatenate two strings.
66. # Write a program to interchange 2 variables without using the third one.
67. # Write programs for String Reversal & Palindrome check
68. # Write a program to find the Factorial of a number
69. # Write a program to generate the Fibinocci Series
70. # Write a program which employs Recursion
71. # Write a program which uses Command Line Arguments
72. # Write a program which uses functions like strcmp(), strcpy()? etc
73. # What are the advantages of using typedef in a program?
74. # How would you dynamically allocate a one-dimensional and two-dimensional array of integers?
75. # How can you increase the size of a dynamically allocated array?
76. # How can you increase the size of a statically allocated array?
77. # 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?
78. # Which function should be used to free the memory allocated by calloc()?
79. # How much maximum can you allocate in a single call to malloc()?
80. # Can you dynamically allocate arrays in expanded memory?
81. # What is object file? How can you access object file?
82. # Which header file should you include if you are to develop a function which can accept variable number of arguments?
83. # Can you write a function similar to printf()?
84. # How can a called function determine the number of arguments that have been passed to it?
85. # Can there be at least some solution to determine the number of arguments passed to a variable argument list function?
86. # How do you declare the following:
87. * An array of three pointers to chars
88. * An array of three char pointers
89. * A pointer to array of three chars
90. * A pointer to function which receives an int pointer and returns a float pointer
91. * A pointer to a function which receives nothing and returns nothing
92. # What do the functions atoi(), itoa() and gcvt() do?
93. # Does there exist any other function which can be used to convert an integer or a float to a string?
94. # How would you use qsort() function to sort an array of structures?
95. # How would you use qsort() function to sort the name stored in an array of pointers to string?
96. # How would you use bsearch() function to search a name stored in array of pointers to string?
97. # How would you use the functions sin(), pow(), sqrt()?
98. # How would you use the functions memcpy(), memset(), memmove()?
99. # How would you use the functions fseek(), freed(), fwrite() and ftell()?
100. # How would you obtain the current time and difference between two times?
101. # How would you use the functions randomize() and random()?
102. # How would you implement a substr() function that extracts a sub string from a given string?
103. # What is the difference between the functions rand(), random(), srand() and randomize()?
104. # What is the difference between the functions memmove() and memcpy()?
105. # How do you print a string on the printer?
106. # Can you use the function fprintf() to display the output on the screen?