Plz explain me with this....?

content=//Program to demonstrate Deletion of an element in a Link List.





#include%26lt;iostream.h%26gt;


#include%26lt;conio.h%26gt;


#include%26lt;string.h%26gt;


struct abc


{


char n[20];


int m;


int p;


int c;


abc *next;


};


void main()


{


clrscr();


int c=0,per;


abc *list,*start=NULL,*ptr,*prev;


char nm[20],flag;


cout%26lt;%26lt;"enter the name and marks of three subjects of five children ";


for(int i=0;i%26lt;=4;i++)


{


if(start==NULL)


{


list=new abc;


cout%26lt;%26lt;"enter the details :";


cin%26gt;%26gt;list-%26gt;n%26gt;%26gt;list-%26gt;p%26gt;%26gt;list-%26gt;c%26gt;%26gt;list-%26gt;...


start=list;


}


else


{


ptr=new abc;





cin%26gt;%26gt;ptr-%26gt;n%26gt;%26gt;ptr-%26gt;p%26gt;%26gt;ptr-%26gt;c%26gt;%26gt;ptr-%26gt;m;


list-%26gt;next=ptr;


list=list-%26gt;next;


} }


// delete the record whose name is entered


cout%26lt;%26lt;"\n enter the name whose record is to be delete \n";


cin%26gt;%26gt;nm;





ptr=start;





cout%26lt;%26lt;"\n the list is :\n";





prev=ptr;


while(ptr!=NULL)//1


{


if(strcmp(ptr-%26gt;n,nm)==0)//3


{


flag='y';//4


cout%26lt;%26lt;"yes got the record ";//5


if (ptr==start)//6


start=ptr-%26gt;next;//7


else


prev-%26gt;next=ptr-%26gt;next;//9


if(ptr-%26gt;next==NULL)//10


prev-%26gt;next=NULL;//11


}


prev=ptr;//12


ptr=ptr-%26gt;next;//13


}//end of while


if(flag!='y')


{


cout%26lt;%26lt;"sorry no such name present \n";


c=4;


}


else


c=5;





//display all the records of the linked list


ptr=start;


cout%26lt;%26lt;"\n\n";


i=0;


cout%26lt;%26lt;"name percentage\n";


while(ptr!=NULL)


{ ++i;


cout%26lt;%26lt;"\n name :"%26lt;%26lt;ptr-%26gt;n;


cout%26lt;%26lt;" percent :"%26lt;%26lt;(ptr-%26gt;p+ptr-%26gt;c+ptr-%26gt;m)/3;


ptr=ptr-%26gt;next;


if (i==c)


break;


}








getch();


}

Plz explain me with this....?
huh?