int main(int argc, char *argv[])
{
FILE *file_a;
int char_a, char_b = strtol(argv[2], NULL, 10), i = 0;
file_a = fopen(argv[1], "r");
while((char_a = getc(file_a)) != EOF)
{
if(i < 128) putchar(char_a ^ char_b) && i++;
else putchar(char_a);
}
fclose(file_a);
return EXIT_SUCCESS;
}