#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
clrscr();
int p,q,r,bi[20];
long num;
cout<<"Enter Binary number:";
cin>>num;
p=0;
while(num>0)
{
bi[p]=num%10;
num=num/10;
p++;
}
q=p-1;
r=0;
while(q>=0)
{
r=r+(bi[q]*pow(2,q));
q--;
}
cout<<r;
getch();
}
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