Question

c++ Please help! i keep getting an error message. I think my main problem is not understanding the circle calculations function and how both the area and the circumference is returned from the function. I know & needs to be used, but I am unsure how to use it.

Copy the following code and run it. You should break it into the following 3 functions getValidinput - which asks the user to enter the radius and then make sure that it is valid before returning it circleCalculations - which uses the raius passed in to calculate both the area and the circumference. The area is returned printResults - sets the fixed and precision and prints out the output #include <iostream> #include <cmath> using namespace std; const double PI - 3.14159; int main() int radius; double area; double circ; cout << "Type a -1 for radius to exit" << endl; cout << "Enter the radius: "; cin >> radius; while (radius > 0) circ - 2* PI * radius; area - PI * pow (radius, 2); cout.setf(ios:: fixed); cout.precision (1); cout << "A circle with radius " << radius << " has a circumference of " << circ << " and an area of " << area << endl << endl; cout << "Enter the radius: "; cin >> radius; Sample Output Type a -1 for radius to exit Enter the radius: 5 A circle with radius 5 has a circumference of 31.4 and an area of 78.5 Enter the radius: - 4 Radius cannot be negative - try again!!! Enter the radius: - 7 Radius cannot be negative - try again!!! Enter the radius: 12 A circle with radius 12 has a circumference of 75.4 and an area of 452.4

Answer 1

21 clang version 7.0.0-3~ubuntu0.18. clang++-7 -pthread -o main main. 8 ./main Enter -1 for radius to exit. void circleCalculations(float r, float &circ, float &area) { 22 PI r r; 23 area = 2 * PI * r; circ 24 Enter the radius: 5 } 25 Radius: 5.0 Сігcumference: 31.4 26 Агеа: 78.5 void printResults(float r, float circ, float area) { 27 cout <<"Radius: " <<r << endl; 28 Enter -1 for radius to exit. <« сirc << endl; cout << "Circumference: Enter the radius : 4 29 Radius: 4.0 Circumference: 25.1 << area << endl << endl; 30 cout << "Area: } 31 Агеа: 50.3 32 Enter -1 for radius to exit. int main) 33 Enter the radius: -0.5 cout.setf(ios: :fixed); 34 invalid radius entered. cout.precision (1) Try again. Enter the radius: -3 invalid radius entered. 35 36 Try again. Enter the radius : -1 27

#include <iostream>

using namespace std;

const double PI = 3.14159;

float getValidInput() {
        float r;
        cout << "Enter -1 for radius to exit." << endl;
        cout << "Enter the radius: ";
        cin >> r;

        while(r != -1 && r < 0) {
                cout << "invalid radius entered." << endl;
                cout << "Try again. Enter the radius: ";
                cin >> r;
        }

        return r;
}

void circleCalculations(float r, float &circ, float &area) {
        area = PI * r * r;
        circ = 2 * PI * r;
}

void printResults(float r, float circ, float area) {
        cout << "Radius: " << r << endl;
        cout << "Circumference: " << circ << endl;
        cout << "Area: " << area << endl << endl;
}

int main() {
        cout.setf(ios::fixed);
        cout.precision(1);

        float circ, area;
        float r = getValidInput();
        while(r != -1) {

                circleCalculations(r, circ, area);
                printResults(r, circ, area);

                r = getValidInput();
        }
}

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