long recover(long x)
{long t=0;
 while(x>0)
 {t=t*10+x%10;
  x=x/10;
 }
 return t;
}
int textx(long x)
{long t,y;y=x;
 while(y>0)
 {t=t*10+y%10;
  y=y/10;
 }
 if(t==x)return 1;
 else return 0;
}
#include<stdio.h>
int main()
{ long x,y,sum;char ch; clrscr();
  do
  { do
    {
     printf("Entre number:");scanf("%d",&x);
     if(x<10||x>9999999)
      { printf("Error!");}

       y=recover(x);
       sum=x+y;
       if(sum>800000000)
       { printf("over!");}

       if(textx(x)==0)
    { printf("%d+%d=%d",x,y,sum); }
       x=sum;


    }while(textx(x)==0);
    printf("'n' or 'ankey'");
    ch=getche();
  }while(ch!='n');
  return 0;
}

运行

TC的可以编译，运行，但结果不对