Biguint < operator - c++

Question

Hi I need help creating a < operator and Im not sure how.
#include "biguint.h"
#include <string>
#include <cstdlib>
#include <iostream>
biguint::biguint()
{
for(size_t i = 0; i < CAPACITY; i++){
data_[i]=0;
}
}
biguint::biguint(const std::string &s){
int templeng = s.length();
for(size_t i = 0; i < templeng; i++){
data_[i] = s[templeng -i - 1] -'0';
}
for(size_t i = templeng; i < CAPACITY; i++){
data_[i]=0;
}
}
unsigned short biguint::operator [](std::size_t pos) const{
unsigned short i = 0;
if(pos >= 0 && pos < CAPACITY){
i = data_[pos];
}
return i;
}
std::ostream& operator <<(std::ostream& out, const biguint& b)
{
for (int i = biguint::CAPACITY; i > 0; i--) {
out<<b[i-1];
}
return out;
}
void biguint::operator += (const biguint & b){
int k = 0;
int temp = 0;
for (size_t i = 0; i < CAPACITY; i++) {
temp = data_[i]+b.data_[i];
if(temp >= 10){
data_[i] = temp-10;
data_[i+1]+=1;
}
else{
data_[i]=temp;
}
}
}
biguint operator + (const biguint & lhs, const biguint & rhs)
{
int temp;
bool remainder = false;
std::string result = "";
std::string reverse = "";
if(lhs.CAPACITY != rhs.CAPACITY)
{
return biguint("0");
}
for(int i =0; i < (int)lhs.CAPACITY;i++)
{
temp = lhs[i]+rhs[i];
if(remainder)
{
temp++;
remainder = false;
}
if(temp<10)
{
result = result + std::to_string(temp);
}
else {
result += std::to_string(temp - 10);
remainder = true;
}
}
for (int i = result.size() - 1; i >= 0; i--) {
reverse += result[i];
}
return biguint(reverse);
}
int biguint::compare(const biguint & b) const
{
return this->toStdString().compare(b.toStdString());
}
std::string biguint::toStdString() const
{
bool start = false;
std::string result = "";
for (int i = (int) this->CAPACITY - 1; i >= 0; i--) {
if (this->data_[i] == 0 && !start) {
if (this->CAPACITY == 1)
result += std::to_string(this->data_[i]);
continue;
}
else {
start = true;
result += std::to_string(this->data_[i]);
}
}
return result;
}
bool operator < (const biguint & lhs, const biguint & rhs)
{
}
This my .cpp file Im kind of lost on how to create < operator. I have created the +,+=, and two string but I'm unsure of how to create the <. Im not sure how to access those numbers for example biguint one("233") how would i access that number

Answer 1

Tl;dr: Try to compare digit by digit while handling mismatched length cases.
Say your given any 2 numbers:
num1 = 12345
num2 = 57632
The intuitive way for you to determine that which is bigger:
Compare them starting from the most significant digit(eg. here 5 > 1)
When equal compare the next significant digit(eg. if the numbers were 92 and 93, you would have compared 2 < 3 to get your answer.
The only difference is here individual digits are stored in an array.
P.S. Your compare seems to do a lexicographic compare - Is that really what you want?