#include <stdio.h>
#include <stdlib.h>
int main(int argc, char* argv[])
{
char* file1 = argv[1];
char* file2 = argv[2];
FILE* fp1 = fopen(file1,"r");
FILE* fp2 = fopen(file2,"r");
int c1 = getc(fp1);
int c2 = getc(fp2);
while((c1 != EOF) && (c2 != EOF))
{
int c3 = c1^c2;
fputc(c3,stdout);
c1 = getc(fp1);
c2 = getc(fp2);
}
fclose(fp1);
fclose(fp2);
}