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实验5-8 使用函数求圆台体积 (10 分)
本题要求实现函数求圆台体积，定义并调用函数volume_tc(r_lower, r_upper, h)计算下底半径为r_lower、上底半径为r_upper
、高度为h的圆台的体积，函数类型是double。
函数接口定义：
double volume_tc(double r_lower, double r_upper, double h);
其中r_lower是圆台的下底半径，r_upper是圆台的上底半径，h是圆台的高度，要求函数计算并返回圆台的体积。
裁判测试程序样例：
#include <stdio.h> #define PI 3.14159 double volume_tc(double r_lower, double
r_upper, double h); int main(void) { double h, r_lower, r_upper, v;
scanf("%lf%lf%lf", &r_lower, &r_upper, &h); v = volume_tc(r_lower, r_upper, h);
printf("%.2f\n", v); return 0; } /* 请在这里填写答案 */
输入样例：
10 30 5
输出样例：
6806.78
答案：
double volume_tc(double r_lower, double r_upper, double h) { return
PI*h*(r_upper*r_upper+r_lower*r_lower+r_lower*r_upper)/3.0; }
