My program compares two text files and puts the differences in file one in a third text file. However, when my file one's size is larger than my file two's size a 'ÿ' character is placed at the end of the third file. For example suppose file one consists of "I like pickles." and file two consists of "I like dogs." then the third file will consist of "pickles.ÿ". Is there a way to get rid of this? And why is this happening? Here is my program:

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

int main(int argc, char *argv[])
{

    int ch1, ch2;
    int size1, size2;
    FILE *fh1, *fh2, *diffone=stdout;

    if( argc<3 ) {
        printf("need two file names\n"); return(1);
    }
    if(!(fh1 = fopen(argv[1], "r"))) {
        printf("cannot open %s\n",argv[1]); return(2);
    }
    if(!(fh2 = fopen(argv[2], "r"))) {
        printf("cannot open %s\n",argv[2]); return(3);
    }
    if(argc>3) {
        if(!(diffone = fopen(argv[3], "w+"))) {
            printf("cannot open %s\n",argv[3]); return(4);
        }
    }

    fseek(fh1, 0, SEEK_END);
    size1 = ftell(fh1);//gets size of fh1
    fseek(fh1, 0, SEEK_SET);

    fseek(fh2, 0, SEEK_END);
    size2 = ftell(fh2);//gets size of fh2
    fseek(fh2, 0, SEEK_SET);

    while((!feof(fh1)) || (!feof(fh2)))
    {
        ch1=ch2='-';
        if(!feof(fh1)) ch1 = getc(fh1);
        if(!feof(fh2)) ch2 = getc(fh2);
    if (size2 > size1)
      {
        if(ch1 != ch2 && (!feof(fh1)))
          {
        fprintf(diffone,"%c", ch1);
          }
      }
    else 
      {
        if (ch1 != ch2)
          {
        fprintf(diffone,"%c", ch1);
          }
      }

    }
}

```