#include<iostream.h>
void main()
{
    int n,r,c,m,j=0;
    cout<<"请输入行数(小于17):";
    cin>>m;
    while(m>=17)
    {
    
        cout<<"你输入的行数超出范围，请重新输入！"<<endl;
        cout<<"请输入行数(小于17):";
        cin>>m;
        

        j++;
        if(j>=2)
        {
            cout<<"你的错误输入以达到3次，你无权再输入！"<<endl;
            return;
        }
    }
    for(n=0;n<=m-1;n++)
    {
        for(r=1;r<=15-n;r++)
            cout<<"  ";//2
        c=1;
        cout<<c<<"   ";//3
        for(r=1;r<=n;r++)
        {
           c=c*(n-r+1)/r;
           if(c<=100)
               if(c<10)
                   cout<<c<<"   ";//3
               else
                   cout<<c<<"  ";//2
               else
                   cout<<c<<" ";//1
        }
        cout<<endl;
    }
}


请问
for(n=0;n<=m-1;n++)
    {
        for(r=1;r<=15-n;r++)
            cout<<"  ";//2
        c=1;
        cout<<c<<"   ";//3
        for(r=1;r<=n;r++)
        {
           c=c*(n-r+1)/r;
           if(c<=100)
               if(c<10)
                   cout<<c<<"   ";//3
               else
                   cout<<c<<"  ";//2
               else
                   cout<<c<<" ";//1
        }
        cout<<endl;
    }
}
这一段是什么意思，尤其是空格不懂哦！
知道的告诉一声谢谢！
小弟新手在学C++！