2、 完善程序下面程序的功能是计算两个圆的周长之差请把程序补充完整。#include stdiohmain 声明函数double r1r2len; r1=33;r2=55; ; 求两个圆的周长只差 printflen=fnlen;double mylendouble r double lengt

#include "stdio.h"

double mylen(double r);

int main() { double r1, r2, len; r1 = 3.3; r2 = 5.5; len = mylen(r1) - mylen(r2); printf("len = %f\n", len); return 0; }

double mylen(double r) { double length; length = 2 * 3.14159 * r; return length; }

运行结果为：len = -9.849560