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dat file txt file help????

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dat file txt file help????

Apr 29th, 2007

Hi everyone again me again I have lots of questions...
I have a program which reads something into a txt file like notepad. But I need to read into a dat file. Here is my code

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#include <stdlib.h>
#include <stdio.h>
main()
{
      int employeeNumber;
      char name[30];
      char engineeringDicipline[40];
      int yearOfBirth;
      FILE *cfPtr;
 
      if((cfPtr = fopen("employee.txt","r")) == NULL)
                printf("File could not be opened\n");
 
      else {
 
           printf("%-20s%-13s%-20s%10s\n", "EmployeeNumber", "Name","EngineeringDicipline", "YearOfBirth");
           printf("________________________________________________________________\n");
           fscanf(cfPtr, "%d%s%s%d", &employeeNumber,name,engineeringDicipline,&yearOfBirth);
           while (!feof(cfPtr)) 
           if(employeeNumber!=0){      
           printf("%-20d%10s  %-20s%7.2d\n",employeeNumber,name,engineeringDicipline,yearOfBirth);
           fscanf(cfPtr, "%d%s%s%d", &employeeNumber,name,engineeringDicipline,&yearOfBirth);}
           system("PAUSE");
           fclose(cfPtr);
           }
system("PAUSE");          
           return 0;
 
}
#include <stdlib.h>
#include <stdio.h>
main()
{
      int employeeNumber;
      char name[30];
      char engineeringDicipline[40];
      int yearOfBirth;
      FILE *cfPtr;
      
      if((cfPtr = fopen("employee.txt","r")) == NULL)
                printf("File could not be opened\n");
      
      else {
           
           printf("%-20s%-13s%-20s%10s\n", "EmployeeNumber", "Name","EngineeringDicipline", "YearOfBirth");
           printf("________________________________________________________________\n");
           fscanf(cfPtr, "%d%s%s%d", &employeeNumber,name,engineeringDicipline,&yearOfBirth);
           while (!feof(cfPtr)) 
           if(employeeNumber!=0){      
           printf("%-20d%10s  %-20s%7.2d\n",employeeNumber,name,engineeringDicipline,yearOfBirth);
           fscanf(cfPtr, "%d%s%s%d", &employeeNumber,name,engineeringDicipline,&yearOfBirth);}
           system("PAUSE");
           fclose(cfPtr);
           }
system("PAUSE");          
           return 0;
           
}

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Re: dat file txt file help????

Apr 29th, 2007

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if((cfPtr = fopen("employee.txt","r")) == NULL)
if((cfPtr = fopen("employee.txt","r")) == NULL)

this is okay I can read it but when I change this to

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if((cfPtr = fopen("employee.dat","r")) == NULL)
if((cfPtr = fopen("employee.dat","r")) == NULL)

it appears some stupid thnings.. like triangels or someting else. I cant read the file....
I mean what is the difference??? why cant I read from dat file????

Last edited by jerryseinfeld; Apr 29th, 2007 at 8:04 am.

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Re: dat file txt file help????

Apr 29th, 2007

There's no difference. manually check to make sure the file exists at the location from which you are trying to open it. Then check the file in notepad to make sure its contents are what you are expecting to read

Last edited by Bench; Apr 29th, 2007 at 8:28 am.

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Re: dat file txt file help????

Apr 29th, 2007

I checked it and saved files differents format dat and txt. They include same things.
But I think only difference is dat file has at the end of lines a blank line.. Is that main problem?. If it is problem I have to make with this blank line and how can I do that??

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Re: dat file txt file help????

Apr 29th, 2007

What operating system and compile are you using? Where did you get those two files? If you are using MS-Windows and you got the files from someone running linux/unix, then your program may not know how to interpret the end-of-line characters correctly.

Also, if the files are small you can zip them up and attach them to your post so that we can have a look at them.

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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Re: dat file txt file help????

Apr 29th, 2007

ok I tried it but system cant accept the dat file upload

Attached Files

employee.txt (274 Bytes, 2 views)

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Re: dat file txt file help????

Apr 29th, 2007

you have to zip them with WinZip or PkZip which will given them a .zip extension.

Last edited by Ancient Dragon; Apr 29th, 2007 at 9:28 am.

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Re: dat file txt file help????

Apr 29th, 2007

I tried winrar but it didnt work now I try zip

in zip file my dat file and txt file my txt file...
so what is the problem??

Attached Files

	1.zip (291 Bytes, 2 views)
	employee.txt (274 Bytes, 0 views)

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Re: dat file txt file help????

Apr 29th, 2007

The problem is not the data files, but that you are using feof() to test for end-of-line. That doesn't always work the way we would like it to. Here's a better solution

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      else {
 
           printf("%-20s%-13s%-20s%10s\n", "EmployeeNumber", "Name","EngineeringDicipline", "YearOfBirth");
           printf("________________________________________________________________\n");
           fscanf(cfPtr, "%d%s%s%d", &employeeNumber,name,engineeringDicipline,&yearOfBirth);
 
// changes start here
           while (fscanf(cfPtr, "%d%s%s%d", &employeeNumber,name,engineeringDicipline,&yearOfBirth))
           {
                if(employeeNumber!=0){      
                    printf("%-20d%10s  %-20s%7.2d\n",employeeNumber,name,engineeringDicipline,yearOfBirth);
                }
           }
           fclose(cfPtr);
           system("PAUSE");          
      }
      else {
           
           printf("%-20s%-13s%-20s%10s\n", "EmployeeNumber", "Name","EngineeringDicipline", "YearOfBirth");
           printf("________________________________________________________________\n");
           fscanf(cfPtr, "%d%s%s%d", &employeeNumber,name,engineeringDicipline,&yearOfBirth);

// changes start here
           while (fscanf(cfPtr, "%d%s%s%d", &employeeNumber,name,engineeringDicipline,&yearOfBirth))
           {
                if(employeeNumber!=0){      
                    printf("%-20d%10s  %-20s%7.2d\n",employeeNumber,name,engineeringDicipline,yearOfBirth);
                }
           }
           fclose(cfPtr);
           system("PAUSE");          
      }