Question

Consider the following C++ program in which the statements are in the incorrect order. Rearrange the statements so that itprompts the user to input the radius of a circle and outputs the area and circumference of the circle-#include {int.main()cout << "Enter the radius: ':cin >> radius;cout << endl;double radius;double area;using namespace std;return 0;cout << "Area = ' << area << endl;area - PI * radius * radius;

Answer 1

Answer:

The correct program to this question can be given as:

Program:

//header file

#include<iostream> //include header file

using namespace std;

//main

int main() //defining method main

{

double radius,area=0; //defining variables

double PI=3.14; //defining variable PI and assign value

cout <<"Enter the radius: "; //message

cin >> radius; //input value by user

area = PI * radius * radius; //formula to calculate area

cout << "Area: "<< area << endl; //print area

return 0;

}

Output:

Enter the radius: 3.0

Area: 28.26

Explanation:

In the above program code, a header file is included. In the next line, the main method is defined, which contain three double type variable that is "radius, area, and PI".

• The radius variable is used to take input by the user, and the area variable is to calculate the area of the circle, and the PI is used to hold a constant value, which is "3.14".
• After taking user input in radius variable the area variable has used the formula of the circle, which calculates a value and in the last print, the function uses "cout", that prints area variable value.