c primer plus 程序清单7.13 分析不出 请教
#include<iostream>const int Len=66;
const int Divs=6;
void subdivide (char ar[],int low,int high,int level);
int main()
{
char ruler [Len];
int i;
for(i=1,i<Len-2;i++)
ruler[i]=' ';
ruler[Len-1]= '\0 ';
int max =Len-2;
int min=0;
ruler[min]=ruler[max]='|';
std::cout<<ruler<<std::endl;
for (i=1;i<=Divs;i++)
{
subdivide(ruler,min,max,i);
std::cout <<ruler<<std::endl;
for (int j=1;j<Len-2;j++)
ruler[j]=' ';
}
return 0;
}
void subdivide(char ar[],int low,int high,int level)
{
if(level==0)
return 0;
int mid=(high+low)/2;
ar[mid]='|';
subdivide(ar,low,mid,level-1);
subdivide(ar,mid,high,level-1);
}
