How do i overload the operators in this code? header file below const int MAX_DI

Question

How do i overload the operators in this code?

header file below

const int MAX_DIGITS = 100;

class bigNum
{
   public:

       void readBig();//function that reads an integer and turns it into
                           //a string and then puts the string back into an integer array.
       void printBig();//function that prints out an integer array.
       bigNum addBig(bigNum); // function that adds two large integers together.
          
private:
       int num[MAX_DIGITS];//an array of type int that will be used to store arrays.

};

implementation file below:

#include "bigNum.h"
#include <iostream>
#include <string>
using namespace std;

// Function that reads an integer and turns it into a string and then puts
// the string back into an integer array.
void bigNum::readBig()
       {   
               string read="";
                cin>>read;
           int len=0, i=0, save=0;
           len= read.length();

               while(i<=MAX_DIGITS-1)
                   {
                   num[i]=0;
                   i++;
                   }
           for (i=0; i <= len-1; i++)
           {
           num[i] = int (read.at(i)-'0');
               }              
               for (i=0;i<=len/2-1;i++)
               {
                   save=num[i];
                   num[i]=num[len-1-i];
                   num[len-1-i]=save;
      
               }  
       }
)// Function with a while loop that skips leading zeros and then uses a for loop to print the number.
       void bigNum::printBig(
      
       {
               int digit=MAX_DIGITS-1;
                   while(num[digit]==0 && digit>0)
                   {
                       digit--;
                   }
                   for (int i=digit; i>=0; i--)
                   {
                       cout<<num[i];
                   }
       }
       // Function that adds the corresponding digits of the first two arrays and
       //stores the answer in the third array. In a second loop, it performs the carry operation.
       bigNum bigNum::addBig(bigNum num2)
                                         
       {
           bigNum sum;
               int i=0;
               while(i<=MAX_DIGITS-1)
               {
                   sum.num[i]=0;
                   i++;
               }
      
               for (int i = MAX_DIGITS - 1; i >= 0; i--)
                {
                sum.num[i] = num[i] + num2.num[i];
               }
                   //checks for carries by changing stored values of 10.
               for (int i = 0; i <= MAX_DIGITS - 2; i++)
       {   
                       sum.num[i + 1] += sum.num[i] / 10;
                       sum.num[i] = sum.num[i] % 10;
  
       }

           return sum;
       }
      

Source code below:

#include "bigNum.h"
#include <iostream>
using namespace std;

int main()
{
// Declare the three numbers, the first, second and the sum:
bigNum num1, num2, sum;
bool finished = false; // a boolean that tests if program is done running.
char response;
while (! finished) //while program is not done running
{
cout << "Please enter a number up to " << MAX_DIGITS << " digits: ";
           num1.readBig(); //Performs readBig on num1
cout << "Please enter a number up to " << MAX_DIGITS << " digits: ";
           num2.readBig(); //Performs readBig on num1
sum=num1.addBig(num2); //Equates sum from two inputs called into addBig.
           num1.printBig(); //Performs printBig on num1.
cout << " + ";
           num2.printBig(); //Performs printBig on num2.
cout << " = ";
           sum.printBig(); //Performs printBig on sum.
cout << " ";
cout << "test again?";
cin>>response;
cin.ignore(900,' ');
finished = toupper(response)!= 'Y';
}
return 0;
}

Explanation / Answer

You can overload operator like +. Add its prototype in header file and add code of addBig() function in operator+ function like I have done in your code below

//Header file

const int MAX_DIGITS = 100;
class bigNum
{
public:
void readBig();//function that reads an integer and turns it into
//a string and then puts the string back into an integer array.
void printBig();//function that prints out an integer array.
bigNum addBig(bigNum); // function that adds two large integers together.
  
bigNum bigNum::operator+ (bigNum num2);
private:
int num[MAX_DIGITS];//an array of type int that will be used to store arrays.
};

Add this function in your cpp file

bigNum bigNum::operator+ (bigNum num2)
{
bigNum sum;
int i=0;
while(i<=MAX_DIGITS-1)
{
sum.num[i]=0;
i++;
}
  
for (int i = MAX_DIGITS - 1; i >= 0; i--)
{
sum.num[i] = num[i] + num2.num[i];
}
//checks for carries by changing stored values of 10.
for (int i = 0; i <= MAX_DIGITS - 2; i++)
{   
sum.num[i + 1] += sum.num[i] / 10;
sum.num[i] = sum.num[i] % 10;
  
}
return sum;
}

// Test your program with this main function

int main()
{
// Declare the three numbers, the first, second and the sum:
bigNum num1, num2, sum;
bool finished = false; // a boolean that tests if program is done running.
char response;
while (! finished) //while program is not done running
{
cout << "Please enter a number up to " << MAX_DIGITS << " digits: ";
num1.readBig(); //Performs readBig on num1
cout << "Please enter a number up to " << MAX_DIGITS << " digits: ";
num2.readBig(); //Performs readBig on num1
sum=num1+num2; //Equates sum from two inputs called into addBig.
num1.printBig(); //Performs printBig on num1.
cout << " + ";
num2.printBig(); //Performs printBig on num2.
cout << " = ";
sum.printBig(); //Performs printBig on sum.
cout << " ";
cout << "test again?";
cin>>response;
cin.ignore(900,' ');
finished = toupper(response)!= 'Y';
}
return 0;
}

// Similarly you can overload -, * and / operators

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