area and circumference of a circle

/* C program to calculate area and circumference of circle */
#include<stdio.h>
#define PI 3.141414
int main()
{
 int radius;
 float area,circumference;
 printf("enter radius of circle");
 scanf("%d",&amp;radius);
 area=PI*radius*radius;
 circumference=2*PI*radius;
 printf("\n area=%f\n circumference=%f",area, circumference);
 return 0;
}

Sample input and output:
enter radius of circle8
area=201.050491
circumference=50.262623