include <stdio.h>

define PI 3.14159

double Area(double r);
int main()
{

double Radii,s;
printf("请输入圆的半径:");
scanf("%1f",&Radii);
s=Area(Radii);
printf("半径为%1f的圆的面积是%1f\n",Radii,s);
return 0;

}
double Area(double r)
{

double s;
s=PI*r*r;
return s;

}
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