problem!!!

Question

mahtab 0 Newbie Poster

18 Years Ago

i have problem in one part of my project
although it's not completed yet...
in function llfined2 there occurs an exeption because of
if(t->b_num==d)....
i don't why it's wrong!!!!!
can any body help me?!:rolleyes:
by the way i use visual c++ 6.0

c++

in.txt (7.33 KB)

Insert ID book = 256 , Name book = BAA ;
Insert ID book = 257 , Name book = CAA ;
Insert ID book = 258 , Name book = DAA ;
Insert ID book = 259 , Name book = EAA ;
Insert ID book = 260 , Name book = FAA ;
Insert ID book = 261 , Name book = GAA ;
Insert ID book = 262 , Name book = HAA ;
Insert ID book = 263 , Name book = IAA ;
Insert ID book = 264 , Name book = JAA ;
Insert ID book = 265 , Name book = KAA ;
Insert ID book = 266 , Name book = LAA ;
Insert ID book = 267 , Name book = MAA ;
Insert ID book = 272 , Name book = NAK ;
Borrow ID book = 260 ;
Borrow ID book = 259 ;
Borrow ID book = 258 ;
Borrow ID book = 257 ;
Borrow ID book = 256 ;
Borrow ID book = 255 ;
Borrow ID book = 254 ;
Borrow ID book = 253 ;
Borrow ID book = 252 ;
Borrow ID book = 251 ;
Return ID book = 265 ;
Return ID book = 264 ;
Return ID book = 263 ;
Return ID book = 262 ;
Return ID book = 261 ;
Return ID book = 260 ;
Return ID book = 259 ;
Return ID book = 258 ;
Return ID book = 257 ;
Return ID book = 256 ;
Return ID book = 255 ;
Return ID book = 254 ;
Return ID book = 253 ;
Return ID book = 252 ;
Return ID book = 251 ;
Return ID book = 250 ;
Return ID book = 249 ;
Return ID book = 248 ;
Return ID book = 247 ;
Return ID book = 246 ;
Delete  ID book = 260 ;
Delete  ID book = 261 ;
Delete  ID book = 262 ;
Delete  ID book = 263 ;
Delete  ID book = 264 ;
Delete  ID book = 265 ;
Delete  ID book = 266 ;
Delete  ID book = 267 ;
Delete  ID book = 268 ;
Delete  ID book = 269 ;
Delete  Name book = BAA ;
Delete  Name book = CAA ;
Delete  Name book = DAA ;
Delete  Name book = EAA ;
Delete  Name book = FAA ;
Delete  Name book = GAA ;
Delete  Name book = HAA ;
Delete  Name book = IAA ;
Delete  Name book = JAA ;
Delete  Name book = KAA ;
PRT books in library ;
PRT books in honesty ;
Insert ID book = 271 , Name book = LAA ;
Insert ID book = 272 , Name book = MAA ;
Insert ID book = 273 , Name book = NAA ;
Insert ID book = 274 , Name book = OAA ;
Insert ID book = 275 , Name book = PAA ;
Insert ID book = 276 , Name book = QAA ;
Insert ID book = 277 , Name book = RAA ;
Insert ID book = 278 , Name book = SAA ;
Insert ID book = 287 , Name book = TAK ;
Borrow ID book = 270 ;
Borrow ID book = 269 ;
Borrow ID book = 268 ;
Borrow ID book = 267 ;
Borrow ID book = 266 ;
Borrow ID book = 265 ;
Borrow ID book = 264 ;
Borrow ID book = 263 ;
Borrow ID book = 262 ;
Borrow ID book = 261 ;
Return ID book = 285 ;
Return ID book = 284 ;
Return ID book = 283 ;
Return ID book = 282 ;
Return ID book = 281 ;
Return ID book = 280 ;
Return ID book = 279 ;
Return ID book = 278 ;
Return ID book = 277 ;
Return ID book = 276 ;
Return ID book = 275 ;
Return ID book = 274 ;
Return ID book = 273 ;
Return ID book = 272 ;
Return ID book = 271 ;
Return ID book = 270 ;
Return ID book = 269 ;
Return ID book = 268 ;
Return ID book = 267 ;
Return ID book = 266 ;
Delete  ID book = 270 ;
Delete  ID book = 271 ;
Delete  ID book = 272 ;
Delete  ID book = 273 ;
Delete  ID book = 274 ;
Delete  ID book = 275 ;
Delete  ID book = 276 ;
Delete  ID book = 277 ;
Delete  ID book = 278 ;
Delete  ID book = 279 ;
Delete  Name book = BAA ;
Delete  Name book = CAA ;
Delete  Name book = DAA ;
Delete  Name book = EAA ;
Delete  Name book = FAA ;
Delete  Name book = GAA ;
Delete  Name book = HAA ;
Delete  Name book = IAA ;
Delete  Name book = JAA ;
Delete  Name book = KAA ;
PRT books in library ;
PRT books in honesty ;
Insert ID book = 286 , Name book = LAA ;
Insert ID book = 287 , Name book = MAA ;
Insert ID book = 288 , Name book = NAA ;
Insert ID book = 289 , Name book = OAA ;
Insert ID book = 302 , Name book = PAK ;
Borrow ID book = 280 ;
Borrow ID book = 279 ;
Borrow ID book = 278 ;
Borrow ID book = 277 ;
Borrow ID book = 276 ;
Borrow ID book = 275 ;
Borrow ID book = 274 ;
Borrow ID book = 273 ;
Borrow ID book = 272 ;
Borrow ID book = 271 ;
Return ID book = 305 ;
Return ID book = 304 ;
Return ID book = 303 ;
Return ID book = 302 ;
Return ID book = 301 ;
Return ID book = 300 ;
Return ID book = 299 ;
Return ID book = 298 ;
Return ID book = 297 ;
Return ID book = 296 ;
Return ID book = 295 ;
Return ID book = 294 ;
Return ID book = 293 ;
Return ID book = 292 ;
Return ID book = 291 ;
Return ID book = 290 ;
Return ID book = 289 ;
Return ID book = 288 ;
Return ID book = 287 ;
Return ID book = 286 ;
Delete  ID book = 280 ;
Delete  ID book = 281 ;
Delete  ID book = 282 ;
Delete  ID book = 283 ;
Delete  ID book = 284 ;
Delete  ID book = 285 ;
Delete  ID book = 286 ;
Delete  ID book = 287 ;
Delete  ID book = 288 ;
Delete  ID book = 289 ;
Delete  Name book = BAA ;
Delete  Name book = CAA ;
Delete  Name book = DAA ;
Delete  Name book = EAA ;
Delete  Name book = FAA ;
Delete  Name book = GAA ;
Delete  Name book = HAA ;
Delete  Name book = IAA ;
Delete  Name book = JAA ;
Delete  Name book = KAA ;
PRT books in library ;
PRT books in honesty ;
Insert ID book = 301 , Name book = LAA ;
Insert ID book = 302 , Name book = MAA ;
Insert ID book = 303 , Name book = NAA ;
Insert ID book = 304 , Name book = OAA ;
Insert ID book = 305 , Name book = PAA ;
Insert ID book = 306 , Name book = QAA ;
Insert ID book = 307 , Name book = RAA ;
Insert ID book = 308 , Name book = SAA ;
Insert ID book = 309 , Name book = TAA ;
Insert ID book = 310 , Name book = UAA ;
Insert ID book = 311 , Name book = VAA ;
Insert ID book = 312 , Name book = WAA ;
Insert ID book = 313 , Name book = XAA ;
Insert ID book = 314 , Name book = YAA ;
Insert ID book = 315 , Name book = ZAA ;
Insert ID book = 316 , Name book = ZBA ;
Insert ID book = 317 , Name book = ZCA ;
Insert ID book = 318 , Name book = ZDA ;
Insert ID book = 319 , Name book = ZEA ;
Insert ID book = 320 , Name book = ZFA ;
Insert ID book = 321 , Name book = ZGA ;
Insert ID book = 322 , Name book = ZHA ;
Insert ID book = 323 , Name book = ZIA ;
Insert ID book = 324 , Name book = ZJA ;
Insert ID book = 325 , Name book = ZKA ;
Insert ID book = 326 , Name book = ZLA ;
Insert ID book = 327 , Name book = ZMA ;
Insert ID book = 328 , Name book = ZNA ;
Insert ID book = 309 , Name book = ZOA ;
Borrow ID book = 290 ;
Borrow ID book = 289 ;
Borrow ID book = 288 ;
Borrow ID book = 287 ;
Borrow ID book = 286 ;
Borrow ID book = 285 ;
Borrow ID book = 284 ;
Borrow ID book = 283 ;
Borrow ID book = 282 ;
Borrow ID book = 281 ;
Return ID book = 325 ;
Return ID book = 324 ;
Return ID book = 323 ;
Return ID book = 322 ;
Return ID book = 321 ;
Return ID book = 320 ;
Return ID book = 319 ;
Return ID book = 318 ;
Return ID book = 317 ;
Return ID book = 316 ;
Return ID book = 315 ;
Return ID book = 314 ;
Return ID book = 313 ;
Return ID book = 312 ;
Return ID book = 311 ;
Return ID book = 310 ;
Return ID book = 309 ;
Return ID book = 308 ;
Return ID book = 307 ;
Return ID book = 306 ;
Delete  ID book = 290 ;
Delete  ID book = 291 ;
Delete  ID book = 292 ;
Delete  ID book = 293 ;
Delete  ID book = 294 ;
Delete  ID book = 295 ;
Delete  ID book = 296 ;
Delete  ID book = 297 ;
Delete  ID book = 298 ;
Delete  ID book = 299 ;
Delete  Name book = BAA ;
Delete  Name book = CAA ;
Delete  Name book = DAA ;
Delete  Name book = EAA ;
Delete  Name book = FAA ;
Delete  Name book = GAA ;
Delete  Name book = HAA ;
Delete  Name book = IAA ;
Delete  Name book = JAA ;
Delete  Name book = KAA ;
PRT books in library ;
PRT books in honesty ;
end ;

library!.cpp (3.98 KB)

#include<stdio.h>
#include<string.h>
#include<conio.h>
#include<stdlib.h>
#define MAX 100
#define max 1000

struct book
{
	char b_name[1000];
	long b_num;
	book* next;
};
struct B_E
{
	int borrow[MAX];
	int exist[max];
}b_e;
struct linklist
{
	book *head;
	book *tail;
};


bool llfind(linklist *me,long d);

book* llfind2(linklist *me,long d);

bool llinit(linklist *me);

bool llinsert(linklist *me,long num,char name[100]);

bool llborrow(linklist *me,long d);

//long printnum(linklist *me);

	linklist l;
	int i=-1;
	int j=-1;

void main(void)
{
	FILE *fp;
	FILE *ff;

	
	llinit(&l);

	fp=fopen("in.txt","r");
	if(!fp)
	{
		printf("can't open the file");
		return;
	}
	
	while(1)
	{
		char cmd[1000];
		if(fscanf(fp,"%s",cmd)!=1)
		{
			fclose(fp);
			return;
		}
	strupr(cmd);


		if(!strcmp(cmd,"INSERT"))
		{
		

			i++;
			long num;
			char cmdd[10],cmddd[100],m[5],name[100];
			char yk[10],mn[100],m2[5];
			char k[5];
			fscanf(fp,"%s%s%s",&cmdd,&cmddd,&m);
			fscanf(fp,"%d",&num);
			fscanf(fp,"%s",&k);
			fscanf(fp,"%s%s%s",&yk,&mn,&m2);
			fscanf(fp,"%s",&name);

			bool qq=llinsert(&l,num,name);
			if(qq==false)
				printf("\nalready exist ID book = %d",num);
			b_e.exist[i]=num;

		}


	

		if(!strcmp(cmd,"BORROW"))
		{
	
			j++;
			long b;
			char cmdd[10],cmddd[100],m[5];
			fscanf(fp,"%s%s%s",cmdd,cmddd,m);
			fscanf(fp,"%d",&b);
			bool aa=llborrow(&l,b);
			if(aa==false)
			{
				printf("not exist books ID =%d",b);
			}
			
		for(int w=0;w<max;w++)
			if(b_e.exist[w]==b)
			{
				b_e.exist[w]=0;
				b_e.borrow[j]=b;
			}

		

	

		}

/*		if(!strcmp(cmd,"RETURN ID BOOK="))
		{
			int r;
			fscanf(fp,"%d",&r);
		}

		if(!strcmp(cmd,"DELETE ID BOOK="))
		{
		
		}
*/
	
	
		
/*		if(!strcmp(cmd,"PRT BOOKS IN LIBRARY ;"))
		{
			printf("\nPRT BOOKS IN LIBRARYYYYYY");
			ff=fopen("out.txt","w");
			if(!ff){printf("can't open the file");return;}
			linklist l;

	//		while(l->head)
	//			fprintf(ff,"%ld",printnum(l));

			book *t=l.head;
			while(!t){
				printf("%d",t->b_num);
				t=t->next;
			}

		}
		

		if(!strcmp(cmd,"PRT BOOKS IN HONESTY ;"))
		{
		
		}

		if(!strcmp(cmd,"END"))
		{
		
		}
		*/
	}
	return;
}
bool llfind(linklist* me,long d)
{
	if(!me)
		return(false);
	if(!me->head)
		return false;
	book* p=me->head;
	while(p)
		if(p->b_num==d)
			return true;
		else
			p=p->next;
		return false;
}
book *llfind2(linklist *me,long d)
{
	if(!me)
			return(NULL);
		if(!me->head)
			return NULL;
		book* t=me->head;
		while(t)
			if(t->b_num==d)
				return t;
		
			else
				t=t->next;
		
			return NULL;
}

bool llinit(linklist *me)
{
	if(!me) return false;
	me->head=me->tail=NULL;
	return true;
}

/*long printnum(linklist *me)
{
	long data=me->head->b_num;
	book *t=me->head;
	me->head=t->next;
	free(t);
	t=NULL;
	if(me->head==NULL)
		me->tail=NULL;
	return data;
}*/



bool llinsert(linklist *me,long num,char name[100])
{
	bool x=llfind(&l,num);
	if(x==true)
	{
		return false;
	}

	book *t=(book *)malloc(sizeof(struct book));
	if(!t)
	{
		printf("memorry low");
		return false;
	}

	if(me->head==NULL)
	{
		me->head=me->tail=t;
	//	t->next=me->tail;
		t->next=NULL;
		t->b_num=num;
		strcpy(t->b_name,name);
	}

	else if(me->head)
	{

		t->b_num=num;
		strcpy(t->b_name,name);
		t->next=NULL;
	
		if(!me->tail)
		{
			me->head=me->tail=t;
		}
		me->tail->next=t;
		me->tail=t;
	}

	printf("\n%d %s inserted",t->b_num,t->b_name);

		return true;
}



bool llborrow(linklist *me,long d)
{

	if(!me)
		return false;
	if(!me->head)
		return false;

//	book *s=me->head;

	book *s=llfind2(&l,d);
	if(s==NULL)
		return false;
	else if(s)
	{
		free(s);
		s=NULL;
	}
	return true;
}

/*	while(s)
	{
		//if(s->b_num==d)
		
		{
			free(s); s=NULL;return true;
			//s=s->next;
		}
		else
			s=s->next;
	}
	return false;
*/

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Latest Post 18 Years Ago Latest Post by Infarction

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Infarction 503 Posting Virtuoso · Answer 1 · 2007-03-16T02:05:27+00:00

My guess would be that t->b_num wasn't initialized properly. Mind you, this is very much a guess. I can't run your code so I can't tell for sure, and you didn't post what the exception was, but I'm assuming it's due to an improperly initialized pointer (in this case the members of t were not set properly).