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#include <iostream>
#include <string>
using namespace std;
class Node
{
public:
int value;
Node * next;
Node();
Node(int);
};
Node::Node():value(0),next(NULL){}
Node::Node(int v):value(v),next(NULL){}
void Print(Node * h)
{
if(!h) return;
Print(h->next);
cout<<h->value;
}
void AddHead(Node* & head, int n)
{
Node * tmp = new Node(n);
tmp->next = head;
head=tmp;
}
void Addition( Node* h1,Node* h2)
{
int carry = 0, sum;
Node* result = NULL;
Node* tmp = NULL;
Node* prev = NULL;
while(h1 !=NULL || h2 != NULL)
{
sum = carry +((h1? h1->value: 0) +(h2? h2->value: 0));
carry = (sum >=10)? 1:0;
sum = sum % 10;
tmp = new Node(sum);
if(result== NULL){
result = tmp;}
else{
prev->next = tmp;}
prev = tmp;
if(h1) h1=h1->next;
if(h2) h2=h2->next;
}
if(carry > 0)
tmp->next = new Node(carry);
Print(result);
}
void Subtraction( Node* h1,Node* h2)
{
int carry = 0, sum;
Node* result = NULL;
Node* tmp = NULL;
Node* prev = NULL;
while(h1 !=NULL || h2 != NULL)
{
sum = carry + ((h2? h2->value: 0) - (h1? h1->value: 0));
carry = (sum < 0)? -1:0;
if(carry < 0) sum += 10;
/*sum = sum % 10;*/
tmp = new Node(sum);
if(result== NULL){
result = tmp;}
else{
prev->next = tmp;}
prev = tmp;
if(h1) h1=h1->next;
if(h2) h2=h2->next;
}
//if(carry < 0)
/*tmp->next = new Node(carry);*/
Print(result);
}
int Length(Node* head)
{
int i=0;
while(head)
{
i++;
head=head->next;
}
return i;
}
int main()
{
string num1,num2;
char operation, ans;
int v;
do
{
Node* h1 = NULL;
Node* h2 = NULL;
cout<<"Enter first number: ";
cin >> num1;
for(unsigned int i=0; i<num1.length(); i++)
{
v= num1[i] - '0';
AddHead(h1,v);
}
Print(h1);
cout<<endl;
cout<<"Enter second number: ";
cin>> num2;
for(unsigned int i=0; i<num2.length(); i++)
{
v= num2[i] - '0';
AddHead(h2,v);
}
Print(h2);
cout<<endl;
cout<<"Do you want to add or substract the numbers enter + or -: ";
cin>>operation;
if(operation == '+')
{
cout<<"Result: ";
Addition(h1,h2);
cout<<endl;
}
else if(operation == '-')
{
cout<<"Result: ";
if(h2 > h1)
{cout<<"-"; Subtraction(h2, h1);}//this is where i switch the numbers
else if(h1 > h2)
{Subtraction(h1,h2);}
cout<<endl;
}
cout<<"Again :";
cin>> ans;
}
while((ans == 'Y') || (ans == 'y'));
return 0;
}
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