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{
#include <iostream>
#include <cstdlib>
#include <cctype>
#include <iomanip>
using namespace std;
const int MAX_DIGITS = 20;
//fetches a sequence of digits from the input,
//converts to integer values, records size
void input( int number[], int& size);
//displays the Large_integer's digits in correct order
//on the screen
void output( const int number[], int size);
//input: two large integers
//output: a large integer that is the sum of the inputs
void add( int first[], int first_size, int second[],
int second_size, int sum[], int& sum_size);
int main()
{
//Design decision: lower indices correspond
//to lower order digits
using namespace std;
//decalare arrays
int first[MAX_DIGITS+1];
int first_size; //number of digits first_size
int second[MAX_DIGITS +1];
int second_size;
int sum[MAX_DIGITS +1];
int sum_size;
//declare type for final answer
char answer;
for(int i = 0; i < MAX_DIGITS - 1; i++)
{
first[i] = 0;
second[i] = 0;
sum[i] = 0;
}
//execute do-while loop until users indicates exit by entering 'n' or 'N'
do
{
//user input for first integer
input(first, first_size);
//user input for second integer
input(second, second_size);
//add the arrays
add(first, first_size, second, second_size, sum_size);
//display ints and sums
}
while (answer == 'y' || answer == 'Y');
system("pause");
return EXIT_SUCCESS;
{
cout << "Large integer summing program " << endl;
cout << "Please enter an integer, 20 digits or less "
<< endl;
//user input fir first int
input( first, first_size );
//print user input
cout << "you entered " << endl;
output (first, first_size);
cout << endl;
cout << "Enter another integer, 20 digits or less" << endl;
//user input for secind int
input( second, second_size );
//print user input
cout << "you entered " << endl;
output (second, second_size);
cout << endl << endl;
//add the arrays
add(first, first_size, second, second_size, sum_size);
//display ints and sums
cout << "The sum is: " << endl;
output(sum, sum_size );
cout << endl;
}
return 0;
}
}
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