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Test2
#include "stdio.h" #define PI 3.14 main() { double r;//圆的半径 double s;//圆的面积 printf("请输入圆的半径:\n");//提示 scanf("%lf",&r);//从键盘上输入圆的面积 s =PI * r * r;//计算圆的半径 printf("圆的面积为(PI=3.14):\n%.2lf\n",s);//屏幕上输出圆的面积 }
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