编写程序，已知圆半径radius=1.25,求圆周长和面积源代码

#include <stdio.h>
#define PI 3.1415926

int main()
{
double radius = 1.25;
double circumference = 2 * PI * radius;
double area = PI * radius * radius;

printf("圆周长为：%.2f\n", circumference);
printf("圆面积为：%.2f\n", area);

return ;
}