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Table of Contents

- How do you subtract two expressions?
- How do you add or subtract functions?
- What is the difference of two functions?
- When a method calls itself this is called?
- Why stack is used for recursion?
- Can a function call itself C++?
- Can we typecast void into int?
- What is default argument function in C++?
- What do you mean by default argument?
- What is default argument in function illustrate with example?
- How are default arguments passed to functions?

To add or subtract two rational expressions with the same denominator, we simply add or subtract the numerators and write the result over the common denominator. When the denominators are not the same, we must manipulate them so that they become the same. In other words, we must find a common denominator.

To add or subtract functions, just add or subtract the values at each point where it makes sense. If the functions are given by formulas, you can just add or subtract the formulas (it doesn’t matter whether you plug in values before or after).

The Difference of Two Functions (f − g)(x) = f(x) − g(x), where x is in the domain of both f and g. The domain of the (f − g)(x) consists of all x-values that are in the domain of both f and g.

Simply stated, recursion is when a function (or procedure) calls itself. Such a function is called “recursive”.

Thus in recursion last function called needs to be completed first. Now Stack is a LIFO data structure i.e. ( Last In First Out) and hence it is used to implement recursion. that provides support for recursion use stack for book keeping.

The main() function can call itself in C++. This is an example of recursion as that means a function calling itself.

You’re return ing the value of int sum by setting a void * address to it. But, if you keep that in mind and get the value of sum by casting a void * to int it will work.

A default argument is a value provided in a function declaration that is automatically assigned by the compiler if the caller of the function doesn’t provide a value for the argument with a default value. When Function overloading is done along with default values.

In computer programming, a default argument is an argument to a function that a programmer is not required to specify. In most programming languages, functions may take one or more arguments. Usually, each argument must be specified in full (this is the case in the C programming language).

Default arguments in Python functions are those arguments that take default values if no explicit values are passed to these arguments from the function call. Let’s define a function with one default argument. def find_square(integer1=2): result = integer1 * integer1 return result.

The default arguments are used when you provide no arguments or only few arguments while calling a function. If you pass only one argument like this: sum(80) then the result would be 100, using the passed argument 80 as first value and 20 taken from the default argument.