新手求帮助 我照书上弄的算圆面积怎么没用啊
[local]1[/local]这是怎么回事啊
#include <stdio.h>
int main(void)
{
const double PI = 3.14;
double radius = 10.0;
double area = PI*radius*radius;
printf("%.2f\n", area);
return 0;
}