# include <iostream.h>
 # include <fstream.h>
 # include <string.h>
 # include <stdlib.h>
 # include <conio.h>

 int main( )
    {
       clrscr( );

       fstream File("CP-17.txt",ios::in|ios::nocreate);

       if(!File)
      {
         cout<<"\n Unable to open the input file."<<endl;
         cout<<"\n Press any key to exit.";

         getch( );
         exit(EXIT_FAILURE);
      }

       char Data[100]={NULL};

       do
      {
         strset(Data,NULL);

         File.getline(Data,80);

         if(strcmp(Data,NULL)==0)
        break;

         cout<<Data<<endl;

         int flag=0;
         int operand_1=0;
         int operand_2=0;

         char* Ptr=NULL;
         char Operator=NULL;

         Ptr=strtok(Data," ");

         if(strlen(Ptr)>5 || atol(Ptr)>32767)
        {
           cout<<"first number too big"<<endl;
           flag=1;
        }

         else
        operand_1=atoi(Ptr);

         Ptr=strtok(NULL," ");

         Operator=Ptr[0];

         Ptr=strtok(NULL,"\n");

         if(strlen(Ptr)>5 || atol(Ptr)>32767)
        {
           cout<<"second number too big"<<endl;
           flag=1;
        }

         else
        operand_2=atoi(Ptr);

         if(flag)
        cout<<"result too big"<<endl;

         else
        {
           long result;

           if(Operator=='+')
              result=operand_1+operand_2;

           elseif(Operator=='*')
              result=operand_1*operand_2;

           if(result>32767)
              cout<<"result too big"<<endl;
        }
      }
       while(1);

       File.close( );

       getch( );
       return 0;
    }