SHREE PRAYAG AIR CONTROLS PRIVATE LIMITED (SPAC PNEUMATIC) Service Engineer Interview Questions and Answers

Name mangling is a technique used by compilers to give unique names to functions and variables to avoid naming conflicts.

• Name mangling is used in C++ to support function overloading.

• It is also used in Python to avoid naming conflicts in modules.

• Name mangling can make it difficult to access variables and functions from outside the class in which they are defined.

• In C++, name mangling can be seen by using the 'nm' comman

Abstract Factory is a creational design pattern that provides an interface for creating families of related objects.

• Abstract Factory is used when we need to create families of related objects without specifying their concrete classes.

• It provides an interface for creating objects of related classes without specifying their concrete classes.

• It encapsulates a group of factories that have a common theme.

• It promotes loose c...read more

Range based map iteration can be done using a for-each loop or iterators.

• Use a for-each loop to iterate over the map elements.

• Alternatively, use iterators to traverse the map.

• The range-based for loop is preferred for its simplicity and readability.

• Example: for(auto const& [key, value] : myMap) { //do something with key and value }

Detached threads are independent threads that run separately from the main thread. Joined threads are threads that wait for the main thread to finish.

• Detached threads are created using pthread_detach() function

• Joined threads are created using pthread_join() function

• Detached threads do not need to be explicitly terminated

• Joined threads must be explicitly terminated using pthread_exit() or return statement

• Detached thread...read more

Static code analysis tools are software programs that analyze source code to find potential issues and improve code quality.

• Static code analysis tools scan code without executing it

• They can detect issues such as security vulnerabilities, coding errors, and performance problems

• Examples of static code analysis tools include SonarQube, ESLint, and Checkstyle

Command to list currently running threads in linux

• Use the 'ps' command with the 'H' option to display threads in a hierarchy

• Use the 'top' command to display threads in real-time

• Use the 'htop' command for an interactive display of threads

No, arithmetic operations cannot be performed on unique pointers.

• Unique pointers are used to manage the lifetime of dynamically allocated objects.

• They cannot be copied or assigned, only moved.

• Arithmetic operations are not defined for pointers, including unique pointers.

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) while C does not.

• C++ allows function overloading while C does not.

• C++ has exception handling while C does not.

OOPs stands for Object-Oriented Programming. It is a programming paradigm based on the concept of objects.

• OOPs focuses on creating objects that contain both data and functions to manipulate that data.

• It emphasizes on encapsulation, inheritance, and polymorphism.

• Examples of OOPs languages are Java, C++, Python, etc.

Polymorphism is the ability of an object to take on many forms.

• It allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Example: A shape class can have different subclasses like circle, square, triangle, etc. and all of them can be treated as shapes.

• Example: A method can have different implementations in different clas...read more

Data abstraction is the process of hiding implementation details and showing only the necessary information to the user.

• It is a way of organizing complex systems

• It allows users to interact with complex systems without needing to understand the underlying details

• It helps to reduce complexity and increase efficiency

• Examples include object-oriented programming and APIs

A C program to reverse a given string.

• Declare a character array to store the input string.

• Use a loop to iterate through the string and swap the characters.

• Print the reversed string.

Swapping two numbers using macro in C language

• Use a temporary variable to store the value of one number

• Assign the value of the second number to the first number

• Assign the value of the temporary variable to the second number

• Define a macro for swapping the numbers

• Example: #define SWAP(a,b) {int temp; temp=a; a=b; b=temp;}