SNGMSG - Encode Message

Encode Message

given below code is for sngmsg spoj or Encode Message spoj.

easy one no need of explanation .

#include <iostream>
#include <stdio.h>
#include <string>
#include <cstring>
using namespace std;
int main()
{
   int t;
   scanf("%d ",&t);
   while(t--)
   {
      char s[600],num[10],result[600],enc[50];
      gets(num);
      gets(s);
      int len_num=strlen(num),i=0,count,j=0,k=0,l;
      l=len_num-1;
      k=len_num;
      while(num[i]!='\0')
      {
         enc[j++]=num[i++];
         enc[k++]=num[l--];
      }
      enc[k]='\0';
      i=0;k=0;count=0;
      while(s[i]!='\0')
      {
         if(count>(2*len_num - 1))
            count=0;
         j=s[i]-(enc[count]-48);
         if(j<97)
            result[k++]=26+j;
         else
            result[k++]=j;
         i++;
         count++;
      }
      result[k]='\0';
      printf("%s\n",result);
   }
   return 0;
}