complete the function that returns the area of a circle with radius r , note, use math.pi for pi.
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Control structures
Control structures are block of statements that analyze the value of variables and determine the flow of execution based on those values. When a program is running, the CPU executes the code line by line. After sometime, the program reaches the point where it has to make a decision on whether it has to go to another part of the code or repeat execution of certain part of the code. These results affect the flow of the program's code and these are called control structures.
Switch Statement
The switch statement is a key feature that is used by the programmers a lot in the world of programming and coding, as well as in information technology in general. The switch statement is a selection control mechanism that allows the variable value to change the order of the individual statements in the software execution via search.
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- my_round(number, integer): Based on the built-in round(...) function. Takes an integer or float and returns a rounded float value that is the number rounded to the second argument's decimal place. First argument can be any float or integer. Second argument must be an integer. Examples: my_round(1234.5678, 2) and round(1234.5678, 2) should return 1234.57. my_round(1234.5678, -2) and round(1234.5678, -2) should return 1200.0.Using the CelsiusToKelvin function as a guide, create a new function, changing the name to KelvinToCelsius, and modifying the function accordingly. #include <iostream>using namespace std; double CelsiusToKelvin(double valueCelsius) {double valueKelvin; valueKelvin = valueCelsius + 273.15; return valueKelvin;} /* Your solution goes here */ int main() {double valueC;double valueK; valueC = 10.0;cout << valueC << " C is " << CelsiusToKelvin(valueC) << " K" << endl; cin >> valueK;cout << valueK << " is " << KelvinToCelsius(valueK) << " C" << endl; return 0;} Please help me with this problem using c++.Que: Write a function to convert temperature from Fahrenheit to Celsius named “ConvertFtoC” that takes one double value for Fahrenheit as argument, and returns the equivalent temperature in Celsius(type double). Create a program that exercise this function by obtaining a Fahrenheit value from the user, calling the function, and displaying the value of Celsius it returns. [Formula: Celsius = (Fahrenheit – 32 ) * 5/9 ] note: use C language
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