#include<stdio.h>
#include<conio.h>
int f(int n,int k)
{
if (n==0)
return 0;
else
if(n%2)
return f(n/2,2*k)+k;
else return f(n/2,2*k)-k;
}
int main()
{
clrscr();
printf("\n %d",f(20,1));
getch();
}
O/p is 9.....Plz explai me how it is come........
Vijay.........
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