Expert: Prince M. Premnath - 12/25/2008

Question
i have a problem whit the code below when i enter c&b&a i wrote my problem in the code  

#include<stdio.h>
#include<stdlib.h>

struct node{

  char LastN[10];
   struct node*link;   
};
void main(){

  int i=0,j=0,n=0,t=0;

  struct node*head=NULL;
  struct node*p=NULL;
  struct node*q=NULL;

  printf("How many student do you want to enter?\n");
   scanf("%d",&n);

  for(i=0;i<=n-1;i++)
  {
     if(head==NULL)

        p=head=(struct node*)malloc(sizeof(struct node));

     else
     {
        p->link=(struct node*)malloc(sizeof(struct node));
        p=p->link;

     }

     p->link=NULL;
     printf("Enter LastName:\n");
      scanf("%s",&p->LastN[j]);
  }

  t=n-2;
   
  q=head;

  

  
  

printf("\nhead->link->LastN:%s,head->link->link->LastN=%s\n",head->link->LastN,head->link->link->LastN);//in this line it prints head->link->LastN=b and head->link->link->LastN=a
                                                                                                 //but in the line below
                                                                                              //when i compare those it should compares b and a
                                                                                             //and we know that b>a and it should print **** for us but it doesn't
                                                                                             //can you tell me why it doesn't print ****


if( head->link->LastN > head->link->link->LastN )
      printf("****\n");
}

thanx bita


Answer
Hai Dear Bita !!

 Actually i can't understand what you are trying to do with this list , yet you have to make sure of one thing ie string comparison is different form character is "a" is no way equal to 'a'

>> struct node{

  char LastN[10];
  struct node*link;
};

Here you have declared LastN as a strin s ( Array of characters ) but the comparison is made only for the starting memory locations and not with the contents ( string)

>> if( head->link->LastN > head->link->link->LastN )

The above statement merely compars the memory address and not the string , so in order to bring the result what you are in need , just make a simple change with your code

>> struct node{

char LastN;
  struct node*link;
};

Declare LastN as character and not as a string , then everything will work fine


Thanks and Regards !
Prince M. Premnath