#include <stdio.h>
//Another test program. This will return the area and radius of a circle when given a radius.
float CircumferenceOfCircle(float);
float AreaOfCircle(float);
const float pi = 3.14159265;
//Since pi is referenced by 2 functions, I declared it as a constant.
int main(void)
{
    float radius;
    float CirOfC;
    float AreaOfC;
    printf("Input the radius of the circle: ");
    scanf("%f", &radius);
    CirOfC = CircumferenceOfCircle(radius);
    AreaOfC = AreaOfCircle(radius);
    printf("\nThe circumference is: %f \n", CirOfC);
    printf("The area is: %f", AreaOfC);
    return 0;
}
float CircumferenceOfCircle(float radius)
{
    return 2*pi*radius;
}

float AreaOfCircle(float radius)
{
    return pi*radius*radius;
}