Thread: why it can not exit the while loop

Here is an attachment named bunny.pdf. It is an OBJ file is read by this program.

The problem now is it can not exit the while loop while it is running. And I do not why it read twice at each line of the OBJ file if I did not use fseek().

Code:

#include <stdio.h>
typedef struct{
	float p1;
	float p2;
	float p3;
}pointv;

typedef struct{
	int  ia;
	int  ib;
	int  ic;
}pointf;

pointv vtemp;
pointf ftemp;

pointv va[510];
pointf fa[1010];


int main(void){
	FILE *fp;
	int  i=1;
	int  j=0;
	char mark;
//	int  end;

	fp=fopen(".\\bunny_1k.obj","rb+");
    
	fscanf(fp,"%c %f %f %f", &mark, &vtemp.p1, &vtemp.p2, &vtemp.p3);
    va[i].p1=vtemp.p1;
	va[i].p2=vtemp.p2;
	va[i].p3=vtemp.p3;



	while( mark!='f' ){
		fprintf(stdout,"%c %f %f %f\n", mark, vtemp.p1, vtemp.p2, vtemp.p3);
		i+=1;
	fscanf(fp,"%c %f %f %f", &mark, &vtemp.p1, &vtemp.p2, &vtemp.p3);
	    va[i].p1=vtemp.p1;
	va[i].p2=vtemp.p2;
	va[i].p3=vtemp.p3;
	}

    fa[j].ia=(int)vtemp.p1;
    fa[j].ib=(int)vtemp.p2;
    fa[j].ic=(int)vtemp.p3;

	while( !feof(fp) ){
		j+=1;
		fscanf(fp,"%c %d %d %d", &mark, &ftemp.ia, &ftemp.ib, &ftemp.ic);
		fa[j].ia=ftemp.ia;
		fa[j].ib=ftemp.ib;
		fa[j].ic=ftemp.ic;
		fprintf(stdout,"%c %d %d %d\n",mark, ftemp.ia, ftemp.ib, ftemp.ic);
	}
	return 0;
}

Mats I am happying for you reply, thanks very much. That 's my first assignment. So now I got it I think.

To me, it seems you are only doing one read and then going into a while loop. If that first character is NOT 'f', you aren't ever going to leave that while loop! Try putting your fscanf inside that while loop and you will probably solve that problem