Write a program to convert degrees Fahrenheit into degrees Celsius.

#include < stdio.h>
// #define PI 3.14 can be used as global declaration
int main()
{
int rad;
float PI = 3.14, area, ci;
printf("\nEnter radius of circle: ");
scanf("%d", &rad);
area = PI * rad * rad;
printf("\nArea of circle : %f ", area);
ci = 2 * PI * rad;
printf("\nCircumference : %f ", ci);
return (0);
}