// ALMOST IDENTICAL TO D0_bIgAdD
bigvalue_t do_bigsub(const bigvalue_t& left,
const bigvalue_t& right){
bigvalue_t result = left;
//.... might work
// initialize variables
digit_t num, left_num, right_num, carry;
signed char temp;
size_t i = 0;
auto itor = result.cbegin();
auto left_itor = left.cbegin();
auto right_itor = right.cbegin();
// loop through each digit and put their sum into the result
while(itor != result.cend()){
// in case left number has less digits
if(left.size() < i) left_num = '0' - '0';
else left_num = *left_itor - '0';
// in case right number has less digits
if(right.size() < i) right_num = '0' - '0';
else right_num = *right_itor - '0';
// deal with individual digit
/////////////////////////////////////////////////////////////////
if(carry != '0') left_num = left_num - ('1' - '0');//// can you
//substrationate chars
temp = (left_num - right_num);// - '0';
carry = '0' - '0';
if(temp < '0' - '0'){
carry = '1' - '0'; //main differences are here...
num = temp + 10;
}
num = temp;
result.push_back(num);
/////////////////////////////////////////////////////////////////
}
return result;
}
bigvalue_t do_bigadd(const bigvalue_t& left,
const bigvalue_t& right){ // supposed tp be private
//needs to return bigvalue_t... not too sure this will work
bigvalue_t result{};// = left;
int maxsize;
int maxl = left.size();
int maxr = right.size();
if(maxl > maxr) maxsize = maxl;
else maxsize = maxr;
//initialize variables
digit_t num;
int left_num, right_num, carry, sum;
auto left_itor = left.cbegin();
auto right_itor = right.cbegin();
// loop through each digit and put their sum into the result
for(int j = 0; j < maxsize; ++j){
// in case left number has less digits
//if(j < maxl and j < maxr) break;
if(j < maxl){
num = *left_itor;
left_num = num - '0';
++left_itor;
}else{
num = '0';
left_num = num - '0';
}
// in case right number has less digits
if(j < maxr){
num = *right_itor;
right_num = num - '0';
++right_itor;
}else{
num = '0';
right_num = num - '0';
}
// deal with individual digit
sum = (left_num + right_num + carry);// - '0';
if(sum > 9){
carry = 1;
sum -= 10;
num = sum + '0';
}else{
carry = 0;
num = sum + '0';
}
result.push_back(num);// mod 10 on char?
sum = 0;
}
if(carry == 1){
num = carry + '0';
result.push_back(num);
}
// not yet made..
// trim_zeros(result);
return result;
//return 2;
}
