two points txt→bin (image coordinates）

#include<stdio.h>

int main(int argc, char *argv[])
{
    //Decralation of variables
    FILE *fpi1,*fpi2,*fpo;
    int id,ix1,iy1,ix2,iy2;
    float x1,y1,z1,x2,y2,z2;
    char nan[4];

    //Open CSV file
    if((fpi1=fopen(argv[1],"r"))==NULL)
    {
        printf ("The file can't be opened. The program is exit.\n");

        return 0;
    }
    //Open CSV file
    if((fpi2=fopen(argv[2],"r"))==NULL)
    {
        printf ("The file can't be opened. The program is exit.\n");

        return 0;
    }


    //Open VTK file for save
    if((fpo=fopen(argv[3],"wb"))==NULL)
    {
        printf("The file can't be opened. The program is exit.\n");

        return 0;
    }


    //count how many lines
    /*
     while((c=fgetc(fpi))!=EOF)
     {
     if(c=='\n')
     newline_count++;
     }
     */

    while(fscanf(fpi1,"%d %f %f %f %s",&id,&x1,&y1,&z1,nan)!=EOF)
    {

        ix1=(int)((x1+28000)-1);
        iy1=(int)((-139500-y1)-1);
        ix2=(int)((x2+28000)-1);
        iy2=(int)((-139500-y2)-1);


        while(fscanf(fpi2,"%d %f %f %f %s",&id,&x2,&y2,&z2,nan)!=EOF)
       {


           ix1=(int)((x1+28000)-1);
           iy1=(int)((-139500-y1)-1);
           ix2=(int)((x2+28000)-1);
           iy2=(int)((-139500-y2)-1);

           printf("%d %f %f %f %d %d %f %f %f %d %d\n",id,x1,y1,z1,ix1,iy1,x2,y2,z2,ix2,iy2);

        fwrite(&id,sizeof(int), 1,fpo);
        fwrite(&x1,sizeof(float),1,fpo);
        fwrite(&y1,sizeof(float),1,fpo);
        fwrite(&z1,sizeof(float),1,fpo);
        fwrite(&ix1,sizeof(int),1,fpo);
        fwrite(&iy1,sizeof(int),1,fpo);
        fwrite(&id,sizeof(int), 1,fpo);
        fwrite(&x2,sizeof(float),1,fpo);
        fwrite(&y2,sizeof(float),1,fpo);
        fwrite(&z2,sizeof(float),1,fpo);
        fwrite(&ix2,sizeof(int),1,fpo);
        fwrite(&iy2,sizeof(int),1,fpo);

           //*
           fprintf(fpo,"%d %f %f %f %d %d %f %f %f %d %d\n",id,x1,y1,z1,ix1,iy1,x2,y2,z2,ix2,iy2);
           //*
       }
    }


    fclose(fpi1);
    fclose(fpi2);
    fclose(fpo);



}