C Programming MCQ Questions Answers

1. When a structure is passed ________ to a function, its members are not copied.

2. If a condition in a post-test loop can never be met, the loop is an _________ loop.

3. An array name and index are separated using ____.

4. The dynamic memory allocation functions are defined in which system header file ?

5. Void pointer vptr is assigned the address of float variable g. What is a valid way to dereference vptr to assign its pointed value to a float variable named f later in the program? float g; void *vptr=&g;

6. What does the ctype tolower() function do?

7. What standard data type provides the smallest storage size and can be used in computations?

8. What is the member access operator for a structure?

9. What is not one of the basic data types in C

10. Which line of code, after execution, results in i having the value of 1?

11. Which is not a storage class specifier?

12. Which operator is used to access the address of a variable?

13. Describe the relationship between lvalue and rvalue.

14. A Stack data structure allows all data operations at one end only, making it what kind of an implementation?

15. By default, C Functions are what type of functions?

16. The main loop structures in C programming are the for loop, the while loop, and which other loop?

17. Directives are translated by the?

18. File input and output (I/O) in C is done through what?

19. Which is not a correct way to declare a string variable?

20. What does the strcmp(str1, str2); function return?

21. File input and output (I/O) in C is heavily based on the way it is done ___?

22. Compile time errors are static errors that can be found where in the code?

23. What is an alternative way to write the expression (*x).y?

24. What is the expression player->name equivalent to?

25. What is not a valid command with this declaration? char *string[20] = { "one", "two", "three"};

26. What is the difference between scanf() and sscanf() functions?

27. A union allows you to store different ___ in the same ___.

28. By default c uses the call by value method to pass arguments to functions. How can you invoke the call by reference method?

29. When is memory for a variable allocated?

30. In C language what are the basic building blocks that are constructed together to write a program?

31. Which function do you use to deallocate memory?

32. In which segment does dynamic memory allocation takes place?

33. C treats all devices, such as the display and the keyboard, as files. Which files opens automatically when a program executes?

34. What is optional in a function declaration?

35. Which is the smallest program to compile and run without errors?

36. In this code sample, what is not a problem for C compiler? main(){ constant int PI = 3.14; printf("%f\n", pi);}

37. What is not one of the reserved words in standard C?

38. A C header file is a file with extension .h that contains function declarations and macro definitons to be shared between several source files. Header files are listed using the preprocessing directive #include, and can have one of the following formats: #include or #include "fileB". What is the difference between these two formats?

39. A pointer to void named vptr, has been set to point to a floating point variable named g. What is the valid way to dereference vptr to assign its pointed value to a float variable named f later in this program? float g; void *vptr=&g;

40. What does the declaration of variable c2 demonstrate? main(){ char c1 ='a'; char c2 = c1+10;}

41. What is the name for calling a function inside the same function?

42. Each array element occupies an area in memory next to, or ____, the others.

43. Many programming languages include a string operation called __________.

44. A(n) ____ loop executes a predetermined number of times.

45. You may define a __________ in the initialization expression of a for loop.

46. When an array is passed to a function, it is actually ________ the array that is/are passed.

47. After a program is coded, it must be ____________.

48. A ________ value in a loop can be either a positive or a negative number.

49. Function strcmp returns __________ if its first argument is equal to its second argument.

50. Objects in an array are accessed with ________, just like any other data type in an array.

51. Common ides include visual studio and ____.

52. Pointers are variables that contain __________ as their values.

53. Functions that do not have a return type are called ____ functions.

54. An inner loop goes through all of its iterations for every single iteration of the ________ loop.

55. A two-dimensional array contains two dimensions: ____.

56. ________ is a construct that defines objects of the same type.

57. ________ functions may have the same name, as long as their parameter lists are different.

58. ________ functions are dynamically bound by the compiler.

59. The -- operator ________.

60. In any program that uses the cin object, you must include the ________.

61. You can use the ____ operator to increment or decrement the value of an enumeration type.

62. With pointer variables, you can ________ manipulate data stored in other variables.

63. When you work with a dereferenced pointer, you are actually working with ________.

64. When you dereference an object pointer, use the ________.

65. When you write a program that stores a value in a variable, you are using ____ storage.

66. When a character is stored in memory, it is actually the ________ that is stored.

67. Value is a function of ___________ and ___________?

68. Usually, when you create nested loops, each loop has its own ____.

69. Using the __________ cipher you choose some number by which to shift each letter of a text.

70. To use the strlen function in a program, you must also write #include ________.

71. To use stream manipulators, you should include the ________ header file.

72. To use files in a c++ program you must include the ________ header file.

73. To create a macro, you can enter a series of commands in the _____ programming language.

74. To compare struct variables, you compare them ____.

75. This code is an example of a(n) ____ while loop.

76. The word “memory” consists of 48 bits, which is equivalent to _____ bytes.

77. The symbol used to represent a loop condition on a flowchart is the ____ symbol.

78. The standard header file for the abs(x)function is ____.

79. The purpose of the __________ is to get the first input value for the validation of a loop.

80. The pointer is indicating the _____.

81. The pl/sql block starts with the ____ clause.

82. The __________ function will return the number of characters in a given string.

83. Members of a(n) ________ union have names, but the union itself has no name.

84. A ____ loop is best used when the specific number of iterations required is known.

85. ________ can be used as pointers.

86. Output of the given program. #include main() { struct b { int on:1; }; struct b v = [1]; printf('%d\n', v.on); }

87. Output of the given program? int main() { int i =1, j=1; for ( ; ; ) { if ( i > 5 ) break; else j += i--; Printf ( '%d\n', j ); i += j; j= j+7; } return 0; }

88. What will happen if in a C program you assign a value to an array element whose subscript exceeds the size of array?

89. Output of the following code? void myFunction(int foo[2][3]) { foo[0][1] = 5; int i = 0, j = 0; for (i = 0; i < 2; i++) for (j = 0; j < 3; j++) printf('%d ', foo[i][j]); } int main() { int foo[2][3] = {0}; myFunction(foo); return 0; }

90. Which is used for dynamically allocating memory?

91. Assuming, integer is 2 byte,Output of the program? #includeint main() { printf('%x\n', -2<<2); return 0; }

92. #pragma exit is primarily used for?

93. Many features of C were derived from an earlier language called _____.

94. #include are ___ files and #include 'somefile.h' ____ files.

95. Which is an invalid identifier?

96. #include int main() { char *var = 'Programming in C is fun.'; } Which format identifier can never be used for the variable var?

97. Which is not a Standard Predefined Macro?

98. Which statement will you add in following program to work it correctly? #includeint main() { printf('%f\n',log(360.0)); return 0; }

99. Considering that integer is 4 bytes long, Output of the code? int main() { intfoobar=20, *foo, *bar; foo=&foobar; /* Assume address of foobar is 2100*/ bar=foo; *foo++=*bar++; foobar++; printf('foobar=%d, foo=%d, bar=%d\n', foobar, foo, bar); return 0; }

100. Considering the definition of a Union MyUnion, if int occupies 4 bytes, what is the memory size occupied by a variable of type MyUnion? union MyUnion { int foo; float bar; char foobar[16]; };