c++第四次实验

<pre name="code" class="cpp">项目6，星型图#include <iostream.h>void main(){int a,b,c=6;    for(a=1;a<=c+1;a++)cout<<" ";cout<<"*"<<endl;for(a=1;a<=c-1;a++){for(b=1;b<=c-a;b++)cout<<" ";cout<<"*";for(b=c-a;b<=c+a;b++)cout<<" ";cout<<"*"<<endl;}for(a=1;a<=2*c-1;a++)cout<<"*"<<" ";}

项目7，三色球问题#include <iostream.h>void main(){int n=1,i,j,k;for(i=0;i<=3;i++)for(j=0;j<=3;j++)for(k=0;k<=6;k++)if(i+j+k==8)cout<<n++<<":红球个数"<<i<<":白球个数"<<j<<":黑球个数"<<k<<endl;}

项目4,1000以内的完数#include <iostream.h>void main(){    int i,k,s(0),n(0);      for(i=2;i<=1000;i++)    {   s=0;    for(k=1;k<=i/2;k++)  {      if(i%k==0)s=s+k;}             if(i==s) {n=n+1;        cout<<"1000以内的完数:"<<i<<endl;      }  }  }