18.7. Write a function that gets radius of a circle and returns area.

#include<stdio.h>

#include<conio.h>
float Area(float r)

{

return M_PI*r*f;

}
void main()

{
float radius;
clrscr ();
printf ("radius: ");
scanf("%f",&radius):
printf ("Enter second number: ");
scanf ("&d", &width):
printf ("Area= %f", Area(radius)); 

getch ();
}