谁帮我看看这段程序错在哪??用函数调用求圆面积的

float PI=3.14159;这行有问题：你可以先声明变量;在赋值float PI;PI=3.14159;或者直接在程序最前面定义 #define PI 3.14159都行还有这行printf("Thank you and see you later.\n);缺双引号#include "stdio.h"#define PI 3.14159float circ_area(float radius) { return PI*radius*radius;} main() { float rd=0.0,area=0.0;printf("Please input the Radius here:");scanf("%f",&rd);if(rd>0) { area=circ_area(rd);printf("\nThe area of this circle is:%f\n",area);} else printf("you have input a wrong Radius\n");printf("Thank you and see you later.\n");} 收起