HDU's ACM 2002 计算球体积

原题链接：HDU's ACM 2002 计算球体积

分析：要具备一定的数学知识。

AC Code：

<span style="font-family:Microsoft YaHei;font-size:14px;">#include <stdio.h>

#define PI 3.1415927

int main()
{
double radius, v;
while(scanf("%lf", &radius) == 1) {
v = 4.0/3.0*PI*radius*radius*radius;
printf("%.3f\n", v);
}
return 0;
}</span>

WHAT HAPPENED!

WA Code:
<span style="font-family:Microsoft YaHei;font-size:14px;">#include <stdio.h>
#include <math.h>

int main()
{
const double PI = 4 * atan(1.0);
double radius, v;
while(scanf("%lf", &radius) == 1) {
v = 4.0/3.0*PI*radius*radius*radius;
printf("%.3f\n", v);
}
return 0;
}</span>