第四次上机作业

一.九九乘法表

#include<iostream>
using namespace std;
int main()
{
int i,j;
for(i=1;i<10;i++)
{
for(j=1;j<=i;j++)
cout<<i<<"x"<<j<<"="<<i*j<<"  ";
cout<<endl;
}
return 0;
}

二.心号输出

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

三.百鸡百钱问题

<pre class="cpp" name="code">include<iostream>
using namespace std;
int main()
{
int x,y,z,count=0;
for(x=0;x<=20;x++)
for(y=0;y<=33;y++)
for(z=0;z<=100;z+=3)
if(100==5*x+3*y+z/3 && 100==x+y+z)
{
++count;
cout<<count<<":"<<x<<" "<<y<<" "<<z<<endl;
}
return 0;
}