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Linux C Question

Posted on 2007-11-20
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Last Modified: 2010-04-22
#include <stdio.h>
int main()
{
      FILE *fp;
       fp = fopen("test.txt", "w");
        int a[100];
        int count=0;
        int i;
        for(i=0; i < 100; i++)
              a[i]=i;
                                                                                                                             
        for(i=0; i < 100; i++)
       {
                if(count > 10)
                {
      fp=fopen("test.txt", "w");
      //fseek(fp, 0, SEEK_SET);
                     //rewind(fp);
                        count=0;
                }
                fprintf(fp, "%d  ", a[i]);
                count++;
         }
}

Please refer the code snippet above, I expect 90 to 100 to be in the file. But there is 1 to 10 in the file.
Could you please suggest a solution
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Question by:sudarshantk
2 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 20324457
fclose(fp);
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LVL 12

Accepted Solution

by:
Jeff Darling earned 125 total points
ID: 20324540
You will definitely need fclose, but that won't solve all your problems.

You should close the file before attempting to open it again.

The way your code is setup, you will open and close the file 10 times.

your file will only have 99 in it at the end if you add fclose(fp) before the open in the If statement and after exiting the 2nd for loop.


#include <stdio.h>
int main()
{
      FILE *fp;
        int a[100];
        int count=0;
        int i;
 
        // open the file
        fp=fopen("test.txt", "w"); 
 
        // fill the array
        for(i=0; i < 100; i++) a[i]=i;
                                                    
        for(i=90; i < 100; i++)
        {
         fprintf(fp,"%d  ",a[i]);                 
        }
        fclose(fp);
        return 0;
}

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