c++作业4

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一、输出星号图

#include <iostream>  using namespace std;  int main()  {      int a,b;      for(a=1;a<=5;a++)      {          cout<<" ";      }      cout<<"*"<<endl;      for(a=2;a<=5;a++)      {          for(b=0;b<=5-a;b++)          {              cout<<" ";          }          cout<<"*";         for(b=0;b<=2*a-4;b++)          {              cout<<" ";          }          cout<<"*"<<endl;      }   for(b=0;b<=2*a-2;b++)      {          cout<<"*";    }  cout<<endl;}

乘法表

#include<iostream>  using namespace std;  int main()  {      int i,j;      for( i=1;i<=9;i++)      {          for(j=1;j<=i;j++)              cout<<j<<"*"<<i<<"="<<i*j<<",";          cout<<endl;      }        }

三色球问题

#include<iostream>using namespace std;int main(){int white,red,black;cout<<"方案有："<<endl;for(white=0;white<=3;white++)for(red=0;red<=3;red++){    black=8-white-red; if(black>=0&&black<=6)    { cout<<"white="<<white<<","<<"red="<<red<<","<<"black="<<black<<endl;}}

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