c语言编写计算矩形面积和周长

#include#definePI3.1415926doublearea(doubler){returnPI*r*r;}doubleperimeter(doubler){return2*PI*r;}i

#includeintmain(){floatr,s,l;scanf("%f",&r);s=3.14*r*r;l=2*3.14*r;printf("s=%f,l=%f\n",s,l);return0;

#include#includeusingnamespacestd;intmain(){constfloatPI=3.1416f;floatr;cin>>r;floatc=2*PI*r;fl

#includedoublecalRectArea(doubledWidth,doubledHeigh){returndWidth*dHeigh;}voidmain(){doublea,b,mul;s

#includeintmain(){doublewidth;doubleheight;printf("请输入矩形的长：");scanf("%lf%*c",&height);printf("请输入矩形的

voidmain(){floatr,s,l;floatpi=3.1415;printf("输入一个圆的半径:\n");scanf("%f",&r);if(

intarea(intx,inty){returnx*y;}intgri(intx,inty){return2*(x+y);}

#include<stdio.h>double zc(double x, double y){    ret

这个貌似你对scanf和printf的用法没搞清楚,正确写法应该是scanf("%f,%f",&a,&b);（&取地址符,表示把值存放在该地址）printf("2*(a+b)=%f,a*b=%f",c

#include <stdio.h>#include <math.h>//double sin(double x);#define&nb

代码大致思路没有错.不过,采用浮点型数据的时候,输入输出的格式不是用%d（整数）,而是用%f所以,把你的代码里,%ld改成%lf,%d改成%f,%.6ld改成%.6lf就可以了.另外,面积公司改成ar

#include "stdio.h"double mianji(double x,double y){   r

p=(a+a+a)/2.0;转换成浮点型再把结果赋给p

.就知道一个周长,怎么求面积啊?N种可能啊满意请采纳

#include#definePremeter(a,b)2*(a+b)#defineArea(a,b)a*bintmain(){doublea,b;printf("请输入矩形的长和宽:\n");sca

#include"stdio.h"//面积doublearea(doublelen,doublewid){returnlen*wid;}//周长doublecircle(doublelen,doubl

#includevoidmain(){doubler,s,l;printf("请输入圆的半径\n");scanf("%lf",&r);s=3.14159*r*r;l=2*3.14159*r;print

#includeintmain(){intlength,width,perimeter;printf("长：");scanf("%d",&length);printf("宽：");scanf("%d"

#include"stdio.h"#definePI3.141592653//定义πintmain(void){floatC,A,V,r;printf("请输入半径：");//提示输入scanf("%

m=2a+2b;应该改成m=2*a+2*b;程序中2a,2b是不允许的,没有意义的.