c=2*Pi*r;area=Pi*r*r;printf("该圆的周长是%.2f，面积是%.2f\n",c,area);}

用c语言求圆的面积编程如下：include<stdio.h>include<math.h>definePI3.14voidmain(){floatr;doublec;doubles;printf("请输入半径的值:");scanf("%f",&r);s=PI*r*r;printf("这个圆的面积是...

c=2*PI*r;area=PI*r*r;printf("该圆的周长是%.2f，面积是%.2f\a",c,area);}

C语言求圆周长和面积方法如下：include"stdio.h"voidmain(){floatPAI=3.14,r,c,area;printf("enterradius:\n");scanf("%f",&r);c=2*PAI*r;area=PAI*r*r;printf("圆半径r=%.2f,圆周长c=%.2f,...

include<stdio.h>intmain(){intr;printf("请输入r：");scanf("%d",&r);if(r>0)printf("面积是：%f\n",2*3.1415*r*r);elseprintf("输入的r不合法！\n");return0;}...

printf("圆的面积=%f平方英寸\n",area);return(0);}2、c语言计算矩形的周长和面积include<stdio.h>/*长方形的高和宽，单位为米*/intwidth;intheight;intarea;intperimeter;intmain(){height=7;width=...

一个简单的方法就是:floatr,s改为：doubler,s圆的面积计算公式？圆的半径=r直径=d圆周率（π）设为3.1415926535……,通常采用3.14作为π的值（圆面积）S圆=π*r*r(圆周长）S圆=πd（半圆的...

include<string.h>intmain(){doubles;floatr;constdoublep=3.14159265358;printf("Pleaseenterr:\t");scanf("%f",&r);if(0<r&&r<1000){s=p*pow(r,2);}printf("%f\n...

打印圆的面积不需要加&

如题，我想知道:C语言编程如何实现“计算圆的面积”?