#include<stdio.h>
#include<conio.h>
void main()
{
int i,n;
float j=0;
clrscr();
printf("enter the no");
scanf("%d",&n);
for(i=n;i>2;i=i-3)
{
j=j+1;
if(i==4)
{
j=j+1.333333;
}
if(i==5)
{
j=j+1.666666;
}
}
printf("%f",j);

getch();

}

The number is N, the decimal places to which the division will be done is  D.

int quot=0,remainder=0,rem=0;

int x=0;

Void DivisionBySubtraction(N,D)
{
     while(N>=3)

      {

         N-=3;

         ++quot;

       }

       if (N==0)

             cout<<"quotient="<<quot;

       else

          {

             while(x<D)

                 {

                    N*=10;

                    while(N>=3)

                         {  N-=3;

                             rem++;

                         }

                      remainder = remainder*10+rem;

                    if (N==0)
                        break;
                    ++x;
                   }
               }
                      
      cout<<"remainder="<<remainder;

}