C语言问题:输入圆的半径r求圆的面积,和周长L.

C语言问题:输入圆的半径r求圆的面积,和周长L.

#include
int main()
{
int r = 0;
float a = 0,l = 0;
scanf("%d",&r);
a = r * r * 3.14;
l = r * 2 * 3.14;
printf("面积:%f,周长:%f",a,l);
return 0;
}