why am i getting a Floating point exception?

int get_digit(long number, int position) {

int digit;

digit = number % (10 ^ (position + 1));

digit = digit / (10 ^ position);

return digit;

}

int num_digits(long number) {

int position;

int number_digits = 16;

for (position = 15; position >= 0; position--) {

if (get_digit(number, position) == 0) {

number_digits = number_digits - 1;

}

else {

position = 0;

}

}

return number_digits;

}

i think the problem is coming from the use of these two functions. in particular, the modulus division line. please help!!