#include<stdio.h>
#include<math.h>
int sum_digit(int);
int oppsite(int,int);
void main()
{
int num,n,sum;
printf("Pls enter a number:");
scanf("%d",&num);
n=sum_digit(num);
printf("counter: %d\n",n);
sum=oppsite(num,n);
printf("\nThe oppsite num is:%d",sum);
scanf("%d",&n);
}
int sum_digit(int num)
{
  int count=0;
  while(num>0)
    {
      count++;
      num=(num/10)  ;
    }
    return(count);
}
int oppsite(int num,int n)
{
  int sum=0,tmp;
    if ((n-1>0)&&(num>0))
    {                                          
      sum=num%10*(pow(10,n-1));
      return(sum+=oppsite(num/10,n-1));
    }
 return(num%10);
}