#include<iostream>
 
int main()
{
    using namespace std;
    int i,OctNum,DecNum = 0,arr[20];
    
    cout<<"Octal Number to Decimal Number converter."<< endl<<endl;
    
    cout<< "Enter the Number: ";
    cin>>OctNum;
    
    for(i=0; OctNum>0; i++)    //Save the individual digits of the Octal number to the array.
    {
        arr[i] = OctNum % 10;
        OctNum = OctNum / 10;
    }
    cout<<i;
    //first digit(in ones place) x (8 raise to 0)+2nd digit(tens) x (8 raise to 1) +...+last digit x (8 raise to n-1) where 'n' is the number of digits
    for(int power=0, j=0; j<i ; j++,power++)
    {
        DecNum = DecNum + arr[j] * pow(8.0,power);
    }
    
    cout<<"The Decimal form is "<<DecNum;
 
    cin.get();
    return 0;
}