Tcg Digital Solutions Software Developer Interview Questions and Answers

Q1. How does map and unordered map are implemented in C++ STL library.
Ans. 
Map and unordered map are implemented as associative containers in C++ STL library.
• Map is implemented as a balanced binary search tree while unordered map is implemented as a hash table.

• Map stores elements in a sorted order while unordered map does not guarantee any specific order.

• Map has a logarithmic time complexity for insertion, deletion, and search operations while unordered map has an average constant time comple...read more
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Q2. Write a program which create a class for student database management and override +, -, and other operators based on the interviewer's ask.
Ans. 
A class for managing student data with operator overloading for addition and subtraction.
• Define a Student class with attributes like name, age, and grades.

• Override the + operator to combine two Student objects' grades.

• Override the - operator to find the difference in grades between two students.

• Example: student1 + student2 returns a new Student with combined grades.

• Example: student1 - student2 returns a new Student wit...read more
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Q3. What are virtual functions, Vtables, and method overriding in C++
Ans. 
Virtual functions are functions that can be overridden in derived classes. Vtables are tables of function pointers used for dynamic dispatch.
• Virtual functions allow for polymorphism and dynamic binding

• Vtables are used to implement virtual functions

• Method overriding is when a derived class provides its own implementation of a virtual function

• Virtual functions are declared using the virtual keyword

• Example: class Animal {...read more
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Q4. How to debug a C++ program containg a segmentation fault using GDB, how to add break points at suspected function, how to take core dumps of a binary.
Ans. 
Debugging C++ program with segmentation fault using GDB
• Compile the program with -g flag to include debugging symbols

• Run the program with GDB and set breakpoints at suspected functions

• Use 'run' command to execute the program within GDB

• Use 'backtrace' command to see the call stack when the segmentation fault occurs

• Use 'print' command to inspect variables and memory addresses

• Use 'core dump' command to generate a core dump...read more
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Q1. What is singleton class?
Ans. 
A singleton class is a class that can only have one instance created at a time.
• Singleton classes are often used in situations where only one instance of a class is needed, such as for managing a database connection or a configuration file.

• The singleton pattern is implemented by making the constructor of the class private and providing a static method that returns the single instance of the class.

• Singleton classes can b...read more
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Q2. How to create a singleton class ?
Ans. 
A singleton class is a class that can only have one instance created throughout the lifetime of an application.
• Create a private constructor to prevent external instantiation.

• Create a private static instance of the class.

• Create a public static method to access the instance.

• Ensure thread safety by using synchronized keyword or static initializer.

• Example: public class Singleton { private static Singleton instance = null; ...read more
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Q3. How to store a key value pairs in C++ data structures where key is same for some of the entries ?
Ans. 
Use C++ map or unordered_map to store key value pairs with same key
• C++ map and unordered_map are associative containers that store elements in key value pairs

• If the key is same for some entries, map will store only one entry while unordered_map can store multiple entries

• Example: map myMap; myMap["key1"] = 1; myMap["key2"] = 2; myMap["key1"] = 3; // myMap["key1"] will be 3

• Example: unordered_map...read more
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Q4. How to grep a value from a file containing key = value format enteries in each line when key is given using bash or shell scripting.
Ans. 
To grep a value from a file with key=value format, use awk command with delimiter as '=' and search for the key.
• Use awk command with delimiter as '=' to split the line into key and value

• Search for the key in the key column and print the corresponding value column

• Example: awk -F'=' '/key/ {print $2}' file.txt
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Q5. Some basic questions on C++ STL library and data structures.
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Q1. Explain Angular hooks
Ans. 
Angular hooks are functions that allow developers to tap into the lifecycle of a component or directive.
• Angular hooks are used to perform actions at specific points in the lifecycle of a component or directive

• There are several types of hooks, including ngOnInit, ngOnChanges, and ngOnDestroy

• ngOnInit is called once when the component is initialized

• ngOnChanges is called whenever a data-bound input property changes

• ngOnDest...read more
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Q2. Explain directives , dependency injection, promise and observables,way features, routing, interceptor, communication between components
Ans. 
Explanation of directives, dependency injection, promise and observables, routing, interceptor, and communication between components.
• Directives are markers on a DOM element that tell AngularJS to attach a specified behavior to that element.

• Dependency Injection is a design pattern that allows a class to be injected with its dependencies rather than creating them itself.

• Promises are objects that represent the eventual co...read more
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Q1. What are the projects and technology that I have worked.
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I was asked to give amcat test as I had less than 3 years of experience.