4 float radius,length,area,pi=3.1415926;
5 radius=1.5;
6 length=2*pi*radius; /*求圆周长*/
7 area=pi*radius*radius; /*求圆面积*/
8 printf("radius=%f\n",radius); /*输出圆半径*/
9 printf("length=%7.2f,area=%7.2f\n",length,area); //输出圆周长、面积
10 }
程序运行结果如下：
radius=1.500000
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