C Programming

What is short int in C programming? a) A data type that usually occupies 4 bytes b) A data type that usually occupies 8 bytes c) A data type that usually occupies 2 bytes d) A data type that usually occupies 1 byte Answer: c) A data type that usually occupies 2 bytes Explanation: short […]

Which of the following is not a valid C variable name? a) var_1 b) 1_var c) _var d) var1 Answer: b) 1_var Explanation: In C, variable names must begin with a letter or an underscore (_). They cannot start with a digit. Therefore, 1_var is not a valid variable name because it begins with a

Who is the father of C language? a) Bjarne Stroustrup b) James Gosling c) Dennis Ritchie d) Ken Thompson Answer: c) Dennis Ritchie Explanation: Dennis Ritchie is widely regarded as the father of the C programming language. He developed C in the early 1970s at Bell Labs, with the intention of designing a language that

Which of the following will occur if we call the free() function on a NULL pointer? a) The program will crash b) The memory will be freed c) Nothing will happen d) The pointer will be reset to NULL Answer: c) Nothing will happen Explanation: If you call the free() function on a NULL pointer

Which of the following should be used to free memory from a pointer allocated using the “new” operator? a) delete b) free() c) dealloc() d) None of the above Answer: a) delete Explanation: In C++, the delete operator should be used to free memory allocated by the new operator. Using free() with new-allocated memory is

Which of the following is the proper syntax for declaring macros in C? a) #define MACRO() b) #macro MACRO c) #define MACRO d) macro_define MACRO Answer: c) #define MACRO Explanation: The correct syntax for declaring a macro in C is using the #define directive followed by the macro name, and optionally, its replacement text. For

Which of the following is not true about structs in C? a) Structs can have members of different data types b) Structs can contain functions c) Structs can be passed to functions d) Structs can be nested Answer: b) Structs can contain functions Explanation: In C, structs are used to group variables of different data

Which of the following is not a storage class specifier in C? a) auto b) register c) static d) int Answer: d) int Explanation: int is a data type in C, not a storage class specifier. Storage class specifiers like auto, register, and static define the lifetime, visibility, and storage location of variables. For example,

Which of the following is an exit controlled loop? a) for loop b) while loop c) do-while loop d) if-else loop Answer: c) do-while loop Explanation: A do-while loop in C is an exit-controlled loop, meaning the loop’s body is executed at least once before the condition is tested. This is different from for and

Which of the following function is used to open a file in C++? a) open() b) fopen() c) ofstream d) ifstream Answer: b) fopen() Explanation: The fopen() function is used to open a file in C. In C++, file handling is typically done using classes like ifstream for input file streams, and ofstream for output

Which of the following are not standard header files in C? a) stdio.h b) conio.h c) math.h d) stdlib.h Answer: b) conio.h Explanation: conio.h is not a standard C header file; it is specific to certain compilers like Turbo C/C++. Standard header files in C include stdio.h (for standard input and output), math.h (for mathematical

Which of the following are correct file opening modes in C? a) “r”, “w”, “b” b) “r”, “w”, “rb”, “wb” c) “rb”, “w”, “wb”, “r” d) “rw”, “wr”, “r”, “w” Answer: b) “r”, “w”, “rb”, “wb” Explanation: In C, file opening modes are specified when you open a file using the fopen() function. Common modes

Which data structure is used to handle recursion in C? a) Queue b) Stack c) Linked List d) Array Answer: b) Stack Explanation: In C, recursion is managed using a data structure called the stack. When a function calls itself recursively, each call is pushed onto the call stack, allowing the program to return to

What is the maximum number of characters that can be held in the string variable char address[40]? a) 39 b) 40 c) 41 d) 38 Answer: a) 39 Explanation: The maximum number of characters that can be held in the string variable char address[40] is 39 because one space is reserved for the null terminator

Each instance of a class has a different set of a) Methods b) Data members c) Static members d) None of the above Answer: b) Data members Explanation: Each instance (object) of a class in C++ has its own set of data members, which are independent of those in other instances. This allows each object

How many instances of a class can be declared? a) Only one b) Ten c) As many as required d) None Answer: c) As many as required Explanation: In C++, you can declare as many instances (objects) of a class as needed. Each instance of a class has its own set of data members, allowing

Why is a macro used in place of a function? a) To save memory b) To increase speed c) For inline expansion d) All of the above Answer: d) All of the above Explanation: Macros in C are often used in place of functions to increase speed and save memory because they provide inline expansion

What is a lint? a) A compiler b) An interpreter c) A debugger d) A tool for analyzing code Answer: d) A tool for analyzing code Explanation: Lint is a tool used to analyze C code for potential errors, bugs, stylistic issues, and suspicious constructs. It helps developers identify issues that might not be caught

What is the 16-bit compiler allowable range for integer constants? a) -3.4e38 to 3.4e38 b) -32768 to 32767 c) -2147483648 to 2147483647 d) -128 to 127 Answer: b) -32768 to 32767 Explanation: On a 16-bit compiler, the allowable range for int data type (which typically takes 2 bytes) is -32768 to 32767. This range is

What is the size of the int data type (in bytes) in C? a) 1 byte b) 2 bytes c) 4 bytes d) 8 bytes Answer: c) 4 bytes Explanation: On most modern systems, the int data type in C occupies 4 bytes of memory, which is equivalent to 32 bits. The size of int

What is the return type of the fopen() function in C? a) FILE * b) int c) char * d) void Answer: a) FILE * Explanation: The fopen() function in C returns a pointer to a FILE object, which is used to control the file being accessed. This FILE * is used in subsequent file

What is the range of values that can be stored by int datatype in C? a) -32768 to 32767 b) -2147483648 to 2147483647 c) 0 to 65535 d) -128 to 127 Answer: b) -2147483648 to 2147483647 Explanation: The int datatype in C typically has a range of -2147483648 to 2147483647 on a 32-bit system, where

What is the disadvantage of arrays in C? a) Fixed size b) Dynamic allocation c) Random access d) None of the above Answer: a) Fixed size Explanation: The main disadvantage of arrays in C is that they have a fixed size, which means the size of the array must be known at compile time and

In which of the following languages is function overloading not possible? a) C b) C++ c) Java d) Python Answer: a) C Explanation: Function overloading, which allows multiple functions with the same name but different parameters, is not supported in C. This feature is available in languages like C++, Java, and Python, where the compiler

How to find the length of an array in C? a) sizeof(arr) b) sizeof(arr) / sizeof(arr[0]) c) length(arr) d) arr.size() Answer: b) sizeof(arr) / sizeof(arr[0]) Explanation: In C, the length of an array can be determined using the expression sizeof(arr) / sizeof(arr[0]). This works by dividing the total size of the array (in bytes) by