读入圆的半径，打印出直径，周长，面积

//读入圆的半径，打印出直径，周长，面积
#include <stdio.h>

//function main begins program execution
int main(void)
{
double r;

printf("请输入圆的半径(小数点后六位)：");
scanf("%lf",&r);

printf("圆的直径：%f\n",2*r);
printf("圆的周长：%f\n",2*3.14159*r);
printf("圆的面积：%f\n",3.14159*r*r); 

}//end function main

标签：function,周长,打印,3.14159,读入,printf,半径,main
来源： https://blog.csdn.net/s13253318528/article/details/100937197