Nothing is written to file

[slippy]

Thanks for your help earlier today!

Here's another: newcalib.cal is empty after execution.

/* Program DIVIDE */

#include <stdio.h>

FILE* one;
FILE* two;
FILE* three;
FILE* four;

int main(void){

  float raw;
  float data;
  float delta;
  int dud;

  one = fopen("my113a_8_00.avg", "r");
  two = fopen("my113a_8_00C.dat", "r");
  three = fopen("differentials.dat", "r");
  four = fopen("newcalib.cal", "w");

  while(!EOF){
    fscanf(one,"%f", &raw);
    fscanf(two,"%f", &data);
    fscanf(three,"%d %f", &dud, &delta);

    printf("%f\n", delta);
    fprintf(four,"%f", raw/(delta+data));
  }

  fclose(one);
  fclose(two);
  fclose(three);
  fclose(four);
}

[whiteflags]

Rather than exercizing proper loop control, you chose to just negate EOF outright. Well, EOF is a negative integer. So what do we end up with...

while( 0 ) {
   /* everything else */
}

No loop, no reading the files, no writing to files.

> one = fopen("my113a_8_00.avg", "r");
> two = fopen("my113a_8_00C.dat", "r");
> three = fopen("differentials.dat", "r");
> four = fopen("newcalib.cal", "w");

Another significant problem is that you didn't make sure all of these FILE pointers were valid after the attempt to open a stream. If fopen didn't work, you don't know about it.

[Sober]

Rather than exercizing proper loop control


Another significant problem is that you didn't make sure all of these FILE pointers were valid after the attempt to open a stream. If fopen didn't work, you don't know about it.

if(!one)
printf("Cannot open file");

This should do..But still I wonder how you can open a stream to file without #include <fstream>

[brewbuck]

This should do..But still I wonder how you can open a stream to file without #include <fstream>

What are you talking about? This is C...

[brewbuck]

fprintf(four,"%f", raw/(delta+data));

Other people told you the real problem. But you need to also put a "\n" at the end of this fprintf() string. Otherwise all your output is going to be jammed together into one very long line.

[slippy]

Other people told you the real problem. But you need to also put a "\n" at the end of this fprintf() string. Otherwise all your output is going to be jammed together into one very long line.

Yeah, I chaged the loop expression and added the `\n' earlier:

while(EOF != fscanf(three, "%d %f", &dud, &delta)){

/* There's probably still room for improvement.... */

}