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C++ - Technical Questions

Introduction

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1. Characteristics of C++.

2. Advantages of OOP.

3. What is Object.

4. Find Output of the following program –

#include 
using namespace std;
void pause(); // Prototype
int main()
{
cout &lt;&lt; endl &lt;&lt; &quot;&quot;Dear reader, &quot;&quot;
&lt;&lt; endl &lt;&lt; &quot;&quot;have a &quot;&quot;;
pause();
cout &lt;&lt; &quot;&quot;!&quot;&quot; &lt;&lt; endl;
return 0;
}
void pause()
{
cout &lt;&lt; &quot;&quot;BREAK&quot;&quot;;
}

Fundamental Types, Constants, and Variables

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5. Use of size of operator.

6. How many keywords are in C++ ?

7. Which are the variables we use to store floating-point values in C++ ?

8. Why we use constant keyword in C++ ?

Using Functions and Classes

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9. What is function ?

10. Can we write a function without a return value ?

11. What is call by value and call by referance ?

12. Can we write function without a return type ? If yes write and example.

13. Usage of srand() and rand() function.

14. What is Class and What is an Object ?

15. What is local function and global function ?

Input and Output with Streams

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16. What is istream and ostream?

17. What are the methods to read and write characters in c++ ?

18. what is a manipulator in C++ ?

19. what is the function of >> operator ?

20. Name four standrad streams in C++

21. What is the use of keyword const ?

Operators for Fundamental Types

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22. How many types of operators are available and there precendece order in C++ ?

23. Binary arithmatic operator example

24. Use of increment and decrement operator

Control Flow

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25. What is the difference between the “if” and “switch” statements in C++?

26. How to implement a loop in C++? Explain the different types of loops.

27. What is the difference between a “for” loop and a “while” loop in C++?

28. How to write an infinite loop in C++?

29. How to use a “break” statement in a “switch” statement?

30. Use a “continue” statement in a “for” loop?

31. What is a “goto” statement and when would you use it in C++?

32. What happens if you forget to update the loop counter in a “for” loop?

Symbolic Constants and Macros

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33. What is a symbolic constant in C++ and how do you define one?

34. How is a macro different from a symbolic constant in C++?

35. What is the purpose of the “#define” preprocessor directive in C++?

36. Example of how to use a macro in C++?

37. What are the drawbacks of using macros in C++?

38. How to create a macro with arguments in C++?

39. What is the difference between a macro and an inline function in C++?

40. How to prevent macro substitution problems such as “token pasting”?

41. How to use a symbolic constant in a switch statement in C++?

42. How to you create a symbolic constant that can be used globally in a C++ program?

Converting Arithmetic Types

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43. How does type casting work in C++?

44. What is the difference between implicit and explicit type casting in C++?

45. How to convert from one data type to another in C++?

46. What is the “static_cast” operator in C++ and how do you use it?

47. What is the “const_cast” operator in C++ and how do you use it?

48. What is the “reinterpret_cast” operator in C++ and how do you use it?

49. What is the “dynamic_cast” operator in C++ and how do you use it?

50. When would you use “static_cast” vs “dynamic_cast” in C++?

51. How to use type casting to convert between arithmetic types in C++?

52. What happens when you try to convert from a larger data type to a smaller data type in C++?

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