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# Tutor profile: Shreyansh B.

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Shreyansh B.
Senior Undergraduate, Computer Science, IIT Bombay
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## Questions

### Subject:Python Programming

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Question:

How to convert a string to an int in python?

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Shreyansh B.

int(x [,base]) − Converts x to an integer. base specifies the base if x is a string.

### Subject:Trigonometry

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Question:

Prove the following: $${tan}^4 \theta+ {tan}^2 \theta = {sec}^4 \theta - {sec}^2 \theta$$

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Shreyansh B.

$${tan}^4 \theta + {tan}^2 \theta = {sec}^4 \theta - {sec}^2 \theta$$ $$LHS = {tan}^2 \theta ( {tan}^2 \theta + 1 )$$ $$LHS = ({sec}^2 \theta - 1 ) ({sec}^2 \theta)$$ [since $${tan}^2 \theta + 1 = {sec}^2 \theta$$] $$LHS = {sec}^4 \theta - {sec}^2 \theta$$ $$LHS = RHS$$

### Subject:C++ Programming

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Question:

What are virtual functions and runtime polymorphism?

Inactive
Shreyansh B.

A virtual function is a member function of a class(parent class) that is expected to be redefined in derived classes(children classes). When a derived class object is referred to using a pointer or a reference to the base class, a virtual function can be called for that object and the derived class's version of the function will be executed. This process of redefining and deciding which function will be called is done at runtime and hence the term polymorphism.

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