c++第四次作业

#include<iostream>
using namespace std;
int main()
{
int i,j;
for(j=1;j<=5;j=j+1)
cout<<" ";
cout<<"*"<<endl;
for(i=2;i<=5;i=i+1)
{
for(j=1;j<=6-i;j=j+1)
cout<<" ";
cout<<"*";
for(j=1;j<=2*i-3;j=j+1)
cout<<" ";
cout<<"*"<<endl;
}
cout<<"***********"<<endl;
return 0;
} 

项目二.百钱买百鸡

#include <iostream>
using namespace std;
int main()
{
int a,b,c;
for(a=0;a<=20;a++)
for(b=0;b<=33;b++)
for(c=0;c<=300;c++)
if((a+b+c==100)&&(5*a+3*b+c/3==100))
{
cout<<"鸡翁"<<a<<"只，母鸡"<<b<<"只，鸡雏"<<c<<"只"<<endl;
}
return 0;
}

项目三.输出完数

#include<iostream>
using namespace std;
int main()
{
int i,j,q,s=0;
for(i=2; i<=1000; i++)
{
for(j=1; j<=i/2; j++)
if(i%j==0)
s=s+j;
if(i==s)
cout<<s<<" ";
s=0;
}
}

项目四. 三色球问题

#include<iostream>
using namespace std;
int main()
{
int i,j,k;
for(i=0;i<=3;i++)
for(j=0;j<=3;j++)
{
k=8-i-j;
if(k<=6)
if(k<=6)cout<<"红球："<<i<<"，白球："<<j<<"，黑球："<<k<<endl;
}
}