#include  <stdio.h>                                             
                                                                    
    main()                                                          
    {                                                               
       char  *filename;                                            
        FILE  *fp1, *fp2;                                           
        int   i, number;                                            
                                                                    
        fp1 = fopen("TEST", "w");                                   
        for(i = 10; i <= 100; i += 10)                              
           putw(i, fp1);                                            
                                                                    
        fclose(fp1);                                                
                                                                    
        printf("\nInput filename\n");                               
                                                                    
    open_file:                                                      
        scanf("%s", filename);                                      
                                                                    
        if((fp2 = fopen(filename,"r")) == NULL)                     
        {                                                           
           printf("Cannot open the file.\n");                       
           printf("Type filename again.\n\n");                      
           goto open_file;                                          
        }                                                           
        elsefor(i = 1; i <= 20; i++)                                    
        {  number = getw(fp2);                                      
           if(feof(fp2))                                            
           {                                                        
              printf("\nRan out of data.\n");                       
              break;                                                
           }                                                        
           else                                                     
              printf("%d\n", number);                               
        }                                                           
                                                                    
        fclose(fp2);                                                
    }                                                               
                                                                    






Output                                                           
                                                                    
   Input filename                                                   
   TETS                                                             
   Cannot open the file.                                            
   Type filename again.                                             
                                                                    
   TEST                                                             
   10                                                               
   20                                                               
   30                                                               
   40                                                               
   50                                                               
   60                                                               
   70                                                               
   80                                                               
   90                                                               
   100                                                            

   Ran out of data.