求i的面积和周长(c语言程序设计)

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

在输入半径的时候,语句改成scanf("%d",&r);不过你最好将半径定义成float型变量,格式的问题

#include"stdio.h"#definePi3.1415926doublezhouchang(doubler){     doubles;&n

scanf("%d",&r);

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

#difinepi3.14#includevoidmain(){floatR=1.5,L,S;L=2*pi*R;S=pi*R*R;printf("L=%fL,S=%fS\n");}

三个C语言题“求三角形的面积和周长”,“输出21世纪所...虽然没有了t她,你的生活或许不在五彩缤纷.

#includeintmain(){doublea=1.5;doubleb=2.3;doublec,d;c=a+a+b+b;d=a*b;printf("面积为%.2f,周长为%.2f",c,d);re

#include#includepublicvoidmain(){doublea,b,c;scanf("%lf%lf%lf",&a,&b,&c);doublearea,preimeter;preime

#includeintmain(){intr=0;floata=0,l=0;scanf("%d",&r);a=r*r*3.14;l=r*2*3.14;printf("面积:%f,周长:%f",a,l)

#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#includemain(){doublearea,length;doubler=pi=3.1215926area=pi*r*r；length=2*pi*r；}

#include//doubleellipse_area(doublea,doubleb);intmain(void){doublea,b;doubles;printf("请输入椭圆的半长轴a,半短轴

假设知道三角形的三边长为a,b,c.程序如下：#include#includedoublearea(doublea,doubleb,doublec){doublearea=0,s=0;s=(a+b+c

#include<stdio.h>#define Pi 3.14159double Square(double r){  &nb

#include#includeintmain(){doublea,b,c,s,area,perimeter;printf("Enter3sidesofthetriangle:");scanf("%l

#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.