Write a C++ Programs to convert Octal number to Decimal number

#include<iostream>

#include<math.h>

using namespace std;

int main()

{

    int num,temp,reminder,sum=0,i=0;

    cout<<"Enter the octal number\n";

    cin>>num;

    temp=num;

    while(temp!=0)

    {

        reminder = temp%10;

        sum=sum+reminder*pow(8,i++);

        temp=temp/10;

    }

    cout<<"\nDecimal Number number= "<<sum;

}