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Top 150 C Interview Questions and Answers 2024

126 questions found

Updated 12 Dec 2024

Q101. Bit operations in C language

Ans.

Bit operations in C language involve manipulating individual bits within a data structure.

Bitwise AND (&) - sets a bit to 1 only if both input bits are 1
Bitwise OR (|) - sets a bit to 1 if either input bit is 1
Bitwise XOR (^) - sets a bit to 1 if the input bits are different
Bitwise NOT (~) - inverts all bits in a number
Left shift (<<) - shifts bits to the left by a specified number of positions
Right shift (>>) - shifts bits to the right by a specified number of positions

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Q102. What are the Benefits of using C++ over C?

Ans.

C++ offers several benefits over C including object-oriented programming, better memory management, and a larger standard library.

C++ supports object-oriented programming which allows for better code organization and reusability.
C++ provides better memory management through features like constructors, destructors, and smart pointers.
C++ has a larger standard library with additional functionalities and data structures compared to C.
C++ supports exception handling which simplif...read more

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Q103. number system convertion in c

Ans.

Number system conversion in C involves converting numbers between different bases, such as decimal to binary or hexadecimal.

Use functions like itoa() to convert integers to strings in different bases
Use strtol() to convert strings to integers in different bases
Remember to specify the base when converting numbers

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Q104. What is a c++ or c difference

Ans.

C++ is an extension of C language with object-oriented features.

C++ supports object-oriented programming while C does not.
C++ has more advanced features like templates, exceptions, and namespaces.
C++ allows function overloading while C does not.
C++ has a standard library that includes many useful functions.
C++ is more complex and harder to learn than C.

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Q105. Storage class in c

Ans.

Storage classes in C define the scope and lifetime of variables.

There are four storage classes in C: auto, register, static, and extern.
Auto variables are stored in the stack and have local scope.
Register variables are stored in CPU registers for faster access.
Static variables retain their value between function calls.
Extern variables are declared in one file and can be accessed in another file.

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Q106. What is the difference in C and C++?

Ans.

C++ is an extension of C with object-oriented programming features.

C++ supports classes and objects while C does not.
C++ has better support for polymorphism and inheritance.
C++ has a standard template library (STL) which provides a collection of classes and functions for common programming tasks.
C++ allows function overloading while C does not.
C++ has exception handling while C does not.

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Q107. tracing cfg and explaining

Ans.

Tracing control flow graph (CFG) involves analyzing the paths that a program can take during execution.

CFG is a representation of all possible paths that can be taken in a program.
Tracing CFG helps in understanding program behavior, identifying optimizations, and detecting errors.
Tools like LLVM's opt tool can be used to generate and visualize CFGs.
Example: In a simple program with if-else statements, tracing the CFG would show the different paths based on conditions.

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Q108. difference between C++ and C

Ans.

C++ is an extension of C with additional features like classes and inheritance.

C++ supports object-oriented programming concepts like classes and inheritance, while C does not.
C++ has a more extensive standard library compared to C.
C++ allows function overloading and templates, which are not available in C.
C++ supports exception handling, while C does not have built-in support for it.

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Q109. C programming memory structure

Ans.

C programming memory structure involves stack, heap, data, and code segments.

Stack: Used for local variables and function call management.
Heap: Used for dynamic memory allocation.
Data: Contains global and static variables.
Code: Contains the program's executable code.

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Q110. What is the difference btw c and c++?

Ans.

C is a procedural programming language while C++ is an object-oriented programming language.

C is a procedural programming language, while C++ is a multi-paradigm language that supports procedural, object-oriented, and generic programming.
C does not support classes and objects, while C++ does.
C does not have built-in support for exception handling, while C++ does with try-catch blocks.
C does not have namespaces, while C++ does to avoid naming conflicts.
C does not have function...read more

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Q111. Different patterns in c programming

Ans.

Some common patterns in C programming include singleton, factory, observer, and strategy patterns.

Singleton pattern ensures a class has only one instance and provides a global point of access to it.
Factory pattern creates objects without specifying the exact class of object that will be created.
Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.
Strategy pattern defi...read more

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Q112. 2.Difference between c and c++

Ans.

C is a procedural programming language while C++ is a combination of procedural and object-oriented programming language.

C is a procedural programming language while C++ is a combination of procedural and object-oriented programming language.
C does not support classes and objects while C++ does.
C does not have function overloading and namespaces like C++.
C does not have exception handling like C++.
C does not have references like C++.

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Q113. Syntax for c program

Ans.

Syntax for a C program involves writing code using specific rules and conventions.

Include header files using #include directive
Declare main function as int main()
Use semicolons to end statements
Use curly braces to define code blocks
Declare variables before using them

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Q114. What is c and c versus c++

Ans.

C is a procedural programming language, while C++ is an object-oriented programming language that is an extension of C.

C is a procedural programming language, focusing on functions and procedures.
C++ is an object-oriented programming language, allowing for the use of classes and objects.
C++ is an extension of C, adding features like classes, inheritance, and polymorphism.

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Q115. Why c++ better than c

Ans.

C++ is better than C due to its object-oriented programming features, better memory management, and greater flexibility.

C++ supports object-oriented programming, allowing for better organization and reusability of code.
C++ has better memory management with features like dynamic memory allocation and deallocation.
C++ offers greater flexibility with features like function overloading and operator overloading.
C++ has a richer standard library compared to C, providing more built-...read more

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Q116. Basic difference between C and C++?

Ans.

C is a procedural programming language while C++ is a combination of procedural and object-oriented programming language.

C is a procedural programming language, focusing on functions and procedures.
C++ is a combination of procedural and object-oriented programming language, allowing for the use of classes and objects.
C does not support classes and objects, while C++ does.
C uses top-down approach, while C++ uses bottom-up approach.
C is a subset of C++.

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Q117. Explain the concepts of C and C++

Ans.

C and C++ are programming languages used for system and application development.

C is a procedural language used for low-level programming and system development.
C++ is an object-oriented language that extends C and adds features like classes and inheritance.
Both languages are widely used in operating systems, embedded systems, and game development.
C++ is often used for developing large-scale applications and software frameworks.
Examples of C and C++ programs include the Linux...read more

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Q118. What is the c and c++

Ans.

C and C++ are programming languages commonly used for system programming and software development.

C is a procedural programming language developed by Dennis Ritchie in 1972.
C++ is an object-oriented programming language based on C, developed by Bjarne Stroustrup in 1983.
C is often used for system programming, embedded systems, and low-level programming.
C++ is used for software development, game development, and high-performance applications.
C++ is an extension of C with added...read more

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Q119. What the difference between C and C++

Ans.

C is a procedural programming language while C++ is an object-oriented programming language.

C is a procedural programming language, focusing on functions and procedures.
C++ is an object-oriented programming language, allowing for classes, objects, and inheritance.
C++ is an extension of C, adding features like classes, templates, and exception handling.
C++ supports both procedural and object-oriented programming paradigms.
C++ is often used for developing complex applications a...read more

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Q120. TELL ME ABOUT C AND C++

Ans.

C and C++ are programming languages commonly used for system programming and software development.

C is a procedural programming language developed by Dennis Ritchie in 1972.
C++ is an object-oriented programming language based on C, developed by Bjarne Stroustrup in 1985.
C is used for system programming, embedded systems, and low-level programming.
C++ is used for software development, game development, and high-performance applications.
C++ supports object-oriented programming ...read more

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Q121. Languages you are comfortable with?[C,C++,...]

Ans.

I am comfortable with C, C++, and Java.

C
C++
Java

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Q122. Work of c & c++

Ans.

C and C++ are programming languages used for system programming, embedded systems, and game development.

C is a procedural language while C++ is an object-oriented language.
C is used for system programming, embedded systems, and low-level programming.
C++ is used for game development, GUI applications, and high-performance software.
C++ supports features like inheritance, polymorphism, and templates.
Both languages are widely used in the industry and have a large community of dev...read more

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Q123. What is diff between c and c++ Any code can u type now

Ans.

C++ is an extension of C with object-oriented programming features.

C++ supports object-oriented programming while C does not.
C++ has classes and objects while C does not.
C++ has function overloading and operator overloading while C does not.
C++ has exception handling while C does not.
C++ supports namespaces while C does not.
C++ has a standard template library (STL) while C does not.

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Q124. What was the problem in c that's y c++ was developed?

Ans.

C lacked features like classes, inheritance, and polymorphism which were needed for object-oriented programming.

C was lacking features like classes, inheritance, and polymorphism which were needed for object-oriented programming.
C++ was developed to add object-oriented programming capabilities to C.
C++ also introduced features like templates, exception handling, and namespaces which were not present in C.

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Q125. C vs c++ difference

Ans.

C is a procedural programming language while C++ is an object-oriented programming language.

C is a procedural language, focusing on functions and procedures.
C++ is an object-oriented language, allowing for classes, objects, and inheritance.
C++ is an extension of C, adding features like classes, templates, and exception handling.

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Q126. oops using c++ / c program

Ans.

Object-oriented programming principles using C++ or C.

Encapsulation: bundling data with methods that operate on that data.
Inheritance: creating new classes from existing classes.
Polymorphism: ability for objects to be treated as instances of their parent class.
Abstraction: hiding complex implementation details from the user.
Example: Creating a class 'Car' with methods like 'startEngine' and 'drive'.

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