Discussion :

[smalto]

bonjour a tous;
j`ai un probleme, qui consiste a lire deux fichiers differents a partid des qu`elles je cree deux listes supposons link1 et link2.
link1 contient certains elements de link2. je dois dc faire une comparaison me permettant de supprimer les elements qu`ils ont en commun dnas link1 et le recrire dans un fichier.
je crois que tout va bien simplement que le code pour la suuppression en bas de la liste ne marche pas, et je n`arrive pas a voir l`erreur surement une question de positon, mais je ne vois rien..

Code :

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#include <stdio.h>
#include <stdlib.h>
#include<string.h>
 
struct stud_info
{
char fname[15];
char lname[15];
int rank ;
float grade;
struct stud_info* next;
};
  
int main ()
	{
	struct stud_info* newnode;
	struct stud_info* link1;
	struct stud_info* link2;
	struct stud_info* read;
	struct stud_info* read2;
	struct stud_info* pre_read;
	
	

		FILE * infile ;
		FILE *infile1;
		FILE* outfile;
		infile= fopen ( "p3data.txt", "r");
		infile1 = fopen("p3purge_data.txt","r");
		outfile= fopen("clean_link.txt","w");
//built link1
		newnode = (struct stud_info*)  malloc(sizeof(struct stud_info));
		newnode->next = NULL;
		link1 = newnode;   
		
		fscanf(infile,"%s %s %d %f",newnode->fname,newnode->lname,&newnode->rank,&newnode->grade);
		printf("%-20s %-20s %-4d %-.2f\n",link1->fname,link1->lname,link1->rank,link1->grade);
		
		while(!feof(infile))
		{
			newnode = (struct stud_info*) malloc(sizeof(struct stud_info));
			newnode->next = link1;
			link1 = newnode;
		    fscanf(infile,"%s %s %d %f",newnode->fname,newnode->lname,&newnode->rank,&newnode->grade);
			printf("%-20s %-20s %-4d %-8.2f\n",link1->fname,link1->lname,link1->rank,link1->grade);
		}
		
printf("\n\n");

        //built link2
        	newnode = (struct stud_info*)  malloc(sizeof(struct stud_info));
		newnode->next = NULL;
		link2 = newnode;
		
		fscanf(infile1,"%s %s %d %f",newnode->fname,newnode->lname,&newnode->rank,&newnode->grade);
		printf("%-20s %-20s %-4d %-8.2f\n",link2->fname,link2->lname,link2->rank,link2->grade);
		
		while(!feof(infile1))
		{
			newnode = (struct stud_info*) malloc(sizeof(struct stud_info));
			newnode->next = link2;
			link2 = newnode;
		    fscanf(infile1,"%s %s %d %f",newnode->fname,newnode->lname,&newnode->rank,&newnode->grade);
			printf("%-20s %-20s %-4d %-8.2f\n",link2->fname,link2->lname,link2->rank,link2->grade);
		}
		
		read2 = link2;
		read=link1;
		pre_read=link1;
		while(read2 != NULL)
		{
			read=link1;
			pre_read=link1;
			while(read != NULL)
			{
				if((strcmp(read->fname,read2->fname)==0) && (strcmp(read->lname,read2->lname)==0))
					{	if(read == link1)//suppression a partir du haut
				
								{	read = read->next;
									pre_read = read;
								}
						if(read->next == NULL)//suppression en bas
								{	
									pre_read->next = read->next;
									read = pre_read;
								}

						if((read != link1)&& (read->next != NULL))//suppression au millieu								{	pre_read->next = read->next;
									read = read->next;
								}
						
					}
			else
					{   pre_read = read;
						read = read->next;
					}
			}

		read2 = read2->next;
		}
		printf("ismmo//////////////\\\\\\\\\\\\\\\\\\\\\\\\\\\n");
		read=link1;
		while(read != NULL)
		{
			printf("%-20s %-20s %-4d %-8.2f\n",read->fname,read->lname,read->rank,read->grade);
			read = read->next;
		}

		read=link1;
		while(read != NULL)
		{
			fprintf(outfile,"%-20s %-20s %-4d %-8.2f\n",read->fname,read->lname,read->rank,read->grade);
			read = read->next;
		}

		   
		fclose(infile);
		fclose(infile1);
		fclose(outfile);
		
return(0);

}

mes deux fichiers sont en piece jointe, et je dois faire la suppression a partir de p3data.txt qui sera link1.