C Programming MCQ Questions Answers

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C Programming multiple choice questions List

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]; };

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What is C Programming Language or C Language?

C programming language or C Language is a powerful general-purpose language that enables you to control the behavior of your computer. It gives you the ability to create programs that run quickly and efficiently. C is one of the most widely used programming languages in the world, and it has been around for more than 40 years. Many software programs are written in C, including popular programs like Adobe Photoshop, Microsoft Office, and Firefox. A program that is written in C language is called C Program. Quizack provides you with the best variety of C language MCQ questions for the excellent preparation for your upcoming examinations.

Who was Ken Thompson?

Ken Thompson was born in New York City on December 4, 1943. He is best known as the co-inventor of the UNIX operating system and the C programming language. Quizack is great hub of knowledge that contains a huge amount of C and C++ programming MCQ multiple-choice questions for all the job applicants or students.

What do you know about Bell Laboratories?

Bell Laboratories is a research and development company that was originally founded in the early 20th century. The company has played a significant role in the development of various technologies, including the transistor, the laser, and Unix. Bell Laboratories also developed the C programming language, which is still used today. All the job aspirants or candidates may study 100 multiple choice questions in C programming with answers available on the Quizack. this will help you to pass any exam or interview.

Programming Language:

A programming language is a notation for writing instructions for a computer. A programming language is precise and unambiguous, meaning that a computer can understand exactly what you want it to do. Quizack is a great hub for learning multiple choice questions on C programming with answers. this practice is free of cost, so if any of the candidates desire to increase their knowledge about C, stay with Quizack.

What is a Header File?

Header files are used to declare functions and variables that are shared between source files. By including a header file in your source code, you can ensure that your program is consistent and that you don't have to redeclare functions or variables unnecessarily.

What is a code snippet?

A code snippet is a small piece of code, usually one or a few lines, which you can use to solve a problem or achieve a desired effect. Code snippets are often stored in text files, but they can also be embedded in web pages or programming languages.

The code snippet can be found online, or you can create your own. When using someone else's code snippet, be sure to read and understand the code fully before using it in your own project.

Creating your own code snippet can be a great way to speed up your work, especially if you find yourself doing the same thing over and over again. To create a snippet, simply type the code into a text editor such as Notepad or TextEdit, and save it with a .snippet extension. When you need to use the snippet, just open the file and copy and paste the code into your project.

When Compilation Error occurs?

A compilation error is an error that occurs when a compiler tries to translate a program into machine code. The most common type of compilation error is a syntax error, which occurs when the programmer makes a mistake in the language's syntax. Other types of errors include runtime errors, which occur when the program is running, and semantic errors, which occur when the program does not do what the programmer intended it to do. Compilation error is usually quite easy to fix, provided the programmer knows where to look for it.

What is const int used for?

Constants are a way of defining unchanging values in your code. In C, you can define a constant as either an int, float, or char. Once you have defined a constant, you can't change its value. This is useful for things like the number pi (3.14159...) or other values that you don't want to change throughout your code.

What is int main used for?

The int main() function is the entry point for a C program. This function is where your program begins execution.

What is an integer pointer?

It is a data type that refers to an integer location in memory. It is a special type of pointer that can only point to integers. Integer pointers are useful for working with arrays of integers because they allow you to access the individual elements of the array more efficiently.

When does a Runtime Error occur?

A runtime error is an error that occurs while the program is running. This type of error can be caused by incorrect code, incorrect input, or other problems. Some common runtime errors include divide by zero errors, syntax errors, and out-of-memory errors. Runtime errors can cause the program to crash or produce unexpected results. It is important to correct runtime errors as soon as possible to avoid any negative consequences.

What is function overloading?

Function overloading is the ability to create multiple functions with the same name, but with different parameter lists. This allows you to perform a particular operation, such as addition or multiplication, on different data types by using the same function name. For example, you could create a function called add that takes two ints as parameters and another function called add that takes two doubles as parameters.

What is the basic data type?

There are five basic data types in C programming: int, char, float, double, and bool. Each one has a specific purpose and can be helpful when you're coding. For example, int is used for integers, while char is typically used for characters. Knowing the different data types and when to use them will help you write more efficient code. You may practice Quizack's most beneficial collection of C and C++ language MCQ questions and answers to polish your knowledge about these languages.

What are data structures?

A data structure is a collection of data values, typically organized in a specific way, and accessed by one or more computer programs. These structures are used to represent information in computer memory, and to store and manipulate that information. Common structures include arrays, queues, stacks, linked lists, trees, hash tables, and graphs. Each data structure has specific advantages and disadvantages, which make it more or less suitable for a given task. If you are willing to learn and practice questions on these languages then visit Quizack from which you can get the most important C language MCQ questions and answers.

What is the UNIX operating system?

Unix operating system is an operating system that was first developed in the early 1970s at Bell Labs. It was designed to be a multi-user, time-sharing system that could run on inexpensive hardware. Unix operating system has remained popular over the years and is now used in a wide variety of applications.

What is b language?

B language is a computer language that was derived from the assembly language. It is used to program computers and to create software. B language is a low-level programming language, which means that it provides access to the specific instructions that a computer uses to carry out tasks. This makes it possible to control every aspect of how a program functions.

What does int len do?

len returns the length of a string, which is the number of characters in the string. It can be used to determine the size of a buffer that is needed to store a string. For example, if you want to store a user's name, you would need to know how many characters are in the user's name so that you can allocate enough space for it.

Define some common c functions?

Quizack is a huge hub of knowledge that presents you with the most significant C programming MCQ with answers for extraordinary preparation for your interviews or exams.

C programming provides a number of built-in functions that you can use in your programs. Some of these are listed here:

printf() – Prints text to the screen
scanf() – Reads input from the keyboard
strlen() – Returns the length of a string
strcpy() – Copies one string to another
strcat() – Appends one string to another
atoi() – Converts a string to an integer
atof() – Converts a string to a floating-point number

What is the macro definition?

A macro is a type of function that is used to create a new symbol. This new symbol can be used to represent a value or a set of code. Macro definitions are often used to make code easier to read and understand. They can also help to improve performance by reducing the number of times that a particular sequence of code needs to be repeated.

Why while loop is used?

A while loop is a programming construct that allows you to repeat a certain set of code multiple times. The while loop will continue to execute the code inside it as long as the condition specified is true. Once the condition becomes false, the while loop will terminate. This makes it a handy tool for performing tasks such as checking a condition over and over again or repeating a set of instructions until a certain condition is met. You can study more about this language through Quizack's best collection of C MCQs. This will help you to assess how much you know about your topic.

What are conditional statements?

These statements are used to control the flow of a program based on certain conditions. There are three main condition statements in C programming: if, else, and switch. The if statement checks a condition and executes a block of code depending on the result. The else statement executes a block of code if the if statement's condition is not met. The switch statement evaluates a given expression and executes a block of code based on the result. A big assortment of MCQs on C presented by Quizack that assembles the most common and the most important questions and answers on this topic so you may learn easily and get your results.

What are switch statements?

A switch statement is a type of control flow statement that allows you to selectively execute code based on the value of a single expression. It's similar to a series of if statements but is more concise and efficient. Quizack is a place to find the essential MCQ of C, you can prepare these MCQs in your free time. This MCQ practice is free of cost.

What is a variable name?

A variable name is a word that is used to represent a value that can change. This can be anything from a number to a string of text. The name assigned to a variable is up to the programmer, and it is important to choose something that will be easy to remember and keep track of. Variable names are case-sensitive, so it is important to be consistent when naming them.

Difference between local variable and global variable?

A local variable is defined inside a function or a block of code, while a global variable is defined outside any function or block of code. Local variables are not accessible from other functions or blocks of code, whereas global variables are. Local variables are destroyed when the function or block of code ends, whereas global variables remain in memory.

What is do while loop?

A do while loop is a control flow statement that allows code to be executed repeatedly based on a given condition. The condition is evaluated after the code block has been executed, meaning that the code block will always be executed at least once.

What are garbage values?

Garbage values are those that have no purpose in a program and can be safely eliminated. In C, these are values that are not used by any pointer variables and have been allocated storage space but never used. As the name suggests, they are like garbage cans - they take up space but don't serve any real function.

What is the standard output?

It is the default destination for all output generated by a C program. This includes both text and any data that is written to output streams.

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