Program to convert the given octal number to the corresponding decimal number

#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
  clrscr();
  int n,num,t,d=0;
  cout<<" Enter the octal number:"<<endl;
  cin>>n;
  num=n;
  t=0;
  while(n>0)
  {
        d+=pow(8,t)*(n%10);
        n=n/10;
        t++;
  }
  cout<<" The decimal equivalent is"<<d<<endl;
  getch();
}