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2StackInAnArray.cpp
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2StackInAnArray.cpp
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#include <iostream>
#include <stdlib.h>
using namespace std;
class twoStacks
{
int *arr;
int size;
int top1, top2;
public:
twoStacks(int n)
{
size = n;
arr = new int[n];
top1 = -1;
top2 = size;
}
void push1(int x)
{
if (top1 < top2 - 1)
{
top1++;
arr[top1] = x;
}
else
{
cout << "Stack Overflow";
exit(1);
}
}
void push2(int x)
{
if (top1 < top2 - 1)
{
top2--;
arr[top2] = x;
}
else
{
cout << "Stack Overflow";
exit(1);
}
}
int pop1()
{
if (top1 >= 0)
{
int x = arr[top1];
top1--;
return x;
}
else
{
cout << "Stack UnderFlow";
return -1;
}
}
int pop2()
{
if (top2 < size)
{
int x = arr[top2];
top2++;
return x;
}
else
{
cout <<endl<< "Stack UnderFlow";
return -1;
}
}
void display()
{
cout << "Stack 1 ";
if (top1 >= 0)
{
for (int i = top1; i >= 0; i--)
cout << arr[i] << " ";
}
else
cout << "Stack is empty";
cout << endl;
cout << "Stack 2: " ;
if (top2 != size)
{
for (int i = top2; i < size; i++)
{
cout << arr[i] << " ";
}
}
else
{
cout << "Stack is empty";
}
cout << endl;
}
};
int main()
{
int n;
cout << "Enter the size of the stack ";
cin >> n;
twoStacks ts(n);
int ch, val;
do
{
cout << "1) Push in stack 1" << endl;
cout << "2) Push in stack 2" << endl;
cout << "3) Pop from stack 1" << endl;
cout << "4) Pop from stack 2" << endl;
cout << "5) Display Stack" << endl;
cout << "6) Exit" << endl;
cout << "Enter choice: " << endl;
cin >> ch;
switch (ch)
{
case 1:
{
cout << "Enter value to be pushed in stack 1:" << endl;
cin >> val;
ts.push1(val);
break;
}
case 2:
{
cout << "Enter value to be pushed in stack 2: " << endl;
cin >> val;
ts.push2(val);
break;
}
case 3:
{
int x = ts.pop1();
if (x != -1)
{
cout << "Popped Value from stack 1 is " << x << endl;
break;
}
break;
}
case 4:
{
int x = ts.pop2();
if (x != -1)
{
cout << "Popped Value from stack 2 is " << x << endl;
break;
}
break;
}
case 5:
{
ts.display();
break;
}
case 6:
{
cout << "Exit" << endl;
break;
}
default:
{
cout << "Invalid Choice" << endl;
}
}
} while (ch != 6);
}