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Writing to a text file in C

Posted on 2012-03-29
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Last Modified: 2012-03-29
Hi -
I have one more question regarding the writing to a text file.   I posted earlier yesterday and resolved the permission issues.   The program is working technically... but not as expected.  I'm not sure what I've done wrong here...   Please view code below and attached files which shows the difference between what the user sees on the display (printf) and what the user sees in the text file (fprintf).   I would appreciate a point in the right direction.   Thanks!

#include <stdio.h>
#include <stdlib.h>


int main (void)
{
      /*LOCAL DEFINITIONS*/

      FILE* fpNumbs;
      void pyramid(FILE *fpNumbs);
      
      /*STATEMENTS*/
      
      
      fpNumbs=fopen("C:\\MyOutput.txt", "w");

      if (fpNumbs == NULL)
      {
            printf("Error opening text file!!\n");
            system("pause");
      }
      else
            pyramid(fpNumbs);
            system("pause");

      return 0;
}



/*~~~~~~~~~~~~~~~~~  pyramid Function ~~~~~~~~~~~~~~~
Run through 9 rows and 9 columns, each time de-incrementing
the column by one.   Display number pattern to user.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

void pyramid(FILE *fpNumbs)
{
/* LOCAL DEFINITIONS */      
int row;
int col;
int counter;

/* STATEMENTS */

row=0;
col=0;
counter=9;

for(row=1;row<=9;row++)
{
for(col=1;col<=counter;col++)
      printf("%d ", col);
                  fprintf(fpNumbs, "%d  ", col);
      fprintf(fpNumbs, "\n");
      printf("\n");
      {
counter=counter-1;
}
}

}/* counter loop*/
output-different.bmp
0
Comment
Question by:mojeaux
  • 2
3 Comments
 
LVL 31

Expert Comment

by:Zoppo
ID: 37781302
Hi mojeaux,

you missed to put a {...} around parts of the code:
for(col=1;col<=counter;col++)
      printf("%d ", col);
                  fprintf(fpNumbs, "%d  ", col);
    ...

Open in new window

is interpreted by the compiler as
for(col=1;col<=counter;col++)
{
      printf("%d ", col);
}
                  fprintf(fpNumbs, "%d  ", col);
...

Open in new window


Change the loop to look like this:
for(row=1;row<=9;row++)
{
      for(col=1;col<=counter;col++)
      {
            printf("%d ", col);
            fprintf(fpNumbs, "%d  ", col);
            fprintf(fpNumbs, "\n");
            printf("\n");
      }
      counter=counter-1;
}

Open in new window

Hope that helps,

ZOPPO
0
 
LVL 31

Accepted Solution

by:
Zoppo earned 2000 total points
ID: 37781335
Sorry, I made a mistake - the printing of 'new line' characters of course has be outside of the for loop's scope:
for(row=1;row<=9;row++)
{
      for(col=1;col<=counter;col++)
      {
            printf("%d ", col);
            fprintf(fpNumbs, "%d  ", col);
      }
      fprintf(fpNumbs, "\n");
      printf("\n");
      counter=counter-1;
}

Open in new window

ZOPPO
0
 

Author Closing Comment

by:mojeaux
ID: 37781510
Perfect... I now see my mistake... keeping the new line in the column loop in stead of the row loop.   Thanks so much.
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