al3_1.c

the examples of c codes.it is very easy,but the basic is important

/*案例代码文件名：AL3_1.C。*/
main()
 {float  radius,length,area,pi=3.1415926;
  radius=1.5;
  length=2*pi*radius;				  /*求圆周长*/
  area=pi*radius*radius;		  	  /*求圆面积*/
  printf("radius=%f\n",radius);			  /*输出圆半径*/
  printf("length=%7.2f,area=%7.2f\n",length,area);/*输出圆周长、面积*/
 }