C++作业4

来源：互联网发布：sql server 2012使用编辑：程序博客网时间：2024/06/01 08:09

项目一：输出1/3-3/5+5/7-7/9…+19/21的结果：

#include <iostream>using namespace std;void main (){int i=1,k=1;    double sum=0;    while  (i<=19){sum=((double)i/(i+2))*k+sum;i=i+2;k=-k;}cout<<"sum="<<sum<<endl;}

项目二：输出星号图：

#include <iostream>using namespace std;void main(){int i,j,k;cout<<"    "<<"*"<<endl;   for (i=2;i<=5;i++)   {     for(j=0;j<5-i;j++)              cout<<" ";          cout<<"*";     for(k=1;k<=2*(i-1);k++)              cout<<" ";          cout<<"*"<<endl;     }               cout<<"************"<<endl;  }

项目三：百钱百鸡问题：

#include <iostream>using namespace std;void main (){   int x,y,z ,count=0;   cout<<"买鸡的方案有"<<endl;   for(x=0;x<=20;x++)       for(y=0;y<=33;y++)   for(z=0;z<=300;z++)   if(5*x+3*y+z/3==100&&x+y+z==100)   {   ++count;   cout<<"方案"<<count<<":"<<x<<"只公鸡"<<y<<"只母鸡"<<z<<"只鸡雏"<<endl;   }}

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