c++第四次作业

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项目2

#include <iostream>    using namespace std;    int main()  {      double i=1,a=3,k=1,sum=0;      while (i<=19&&a<=21)      {          sum=sum+i/a*k;          i=i+2;          a=a+2;          k=-k;      }           cout<<"1/3-3/5+5/7-7/9…+19/21的结果为"<<sum<<endl;      return 0;  }

项目6 星号

#include <iostream>    using namespace std;    int main()  {       int i,k,n=6;      for(i=1; i<=n-1; i=i+1)          cout<<" ";      cout<<"*"<<endl;      for(i=2;i<=n-1;i=i+1)      {          for(k=1; k<=n-i; k=k+1)              cout<<" ";          cout<<"*";          for(k=1; k<=2*i-3; k=k+1)              cout<<" ";          cout<<"*"<<endl;      }      for(i=1; i<=2*n-1; i=i+1)          cout<<"*";      return 0;  }

百鸡鸡

<span style="font-size:14px;">#include<iostream>  using namespace std;  int main()  {      float x,y,z;      for(x=0;x<=100;x++)          for(y=0;y<=100;y++)          {              z=100-x-y;              if(5*x+3*y+z/3==100) cout<<"鸡翁"<<x<<"只，"<<"鸡母"<<y<<"只，"<<"鸡雏"<<z<<"只"<<endl;          }          return 0;  }</span>

三色球

<span style="font-size:18px;">#include<iostream>  using namespace std;  int main()  {      float x,y,z;      for(x=0;x<=3;x++)          for(y=0;y<=3;y++)          {              z=8-x-y;              if(z<=6) cout<<"白球"<<x<<"个，"<<"红球"<<y<<"个，"<<"黑球"<<z<<"个"<<endl;          }          return 0;  }</span>

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