Area of Circle

#include<stdio.h>

#include<conio.h>
void main()
{
float area(float);
float r,a;
clrscr();
printf("Enter the radius\n");
scanf("%f",&r);
a=area(r);
printf("Radius=%f\tArea=%f\n",r,a);
getch();
}

float area(float r)
{
float t;
t=3.14*r*r;
return t;
}


OUTPUT:

Enter the radius

5

Radius=5.000000  Area=78.500000