Modify the bigint class by

adding the > operation to determine whether one bigint object is bigger than another.

adding the subtraction operation - to class bigint: int1 - int2 which should return 0 if int1 is less than int2.

(bonus) adding the multiplication operation * to class bigint.

the bigint.

#include
#include
using namespace std;

#include "bigint. h"

// definition of read()
void bigint: : read(istream & in)
{
static bool instruct = true;
if (instruct)
{
cout < < "enter " < < digits_per_block < < "-digit blocks, separated by "
"spaces.\nenter a negative integer in last block to signal "
"the end of input.\n\n";
instruct = false;
}
short int block;
const short int max_block = (short) pow(10.0, digits_per_block) - 1;
for (; ; )
{
in > > block;
if (block < 0) return;

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