# Answer to Question #1598 in C++ for idaira

Question #1598

Write a C++ program that takes in the radius (as in integer) of a circle from user and calculate the area of the circle through a function. If the area is greater than 50, display the circle’s area along with a message that the circle is big else display the circle’s area and the message that the circle is small. Define a function named calculateArea() to take in the radius as its argument and calculate the circle’s area before returning the area as type double.

Expert's answer

#include <iostream>

#include <cmath>

using namespace std;

double calculateArea(double);

int main(int argc, char** argv)

{

double radius;

do

{

cout << "Input the value of radius: ";

cin >> radius;

}

while(radius <= 0);

double area = calculateArea(radius);

if(area > 50)

cout << area << endl << "The circle is big." << endl;

else

cout << area << endl << "The circle is small." << endl;

return 0;

}

double calculateArea(double radius)

{

return M_PI * pow(radius, 2) / 2.0;

}

#include <cmath>

using namespace std;

double calculateArea(double);

int main(int argc, char** argv)

{

double radius;

do

{

cout << "Input the value of radius: ";

cin >> radius;

}

while(radius <= 0);

double area = calculateArea(radius);

if(area > 50)

cout << area << endl << "The circle is big." << endl;

else

cout << area << endl << "The circle is small." << endl;

return 0;

}

double calculateArea(double radius)

{

return M_PI * pow(radius, 2) / 2.0;

}

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