fprintf and writing on the screen at the same time

[Prolapsis]

Hi

I'm learning files in C languagem but I'm with a problem. I always thought that when we do a fprintf to write something into a file (in this case using "a") this something would be written in the debug display :S

I tested with this program but nothing is written in the debug:

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

int main()
{
	FILE * xyz;
	
	
	xyz = fopen("example.txt","a");
	fprintf(xyz,"12345\n");
	fclose(xyz);

	xyz = fopen("example.txt","a");
	fprintf(xyz,"67890\n");
	fclose(xyz);

	system("pause");

	return 0;
}

Is there any way or some process to write into a file and to the debug screen at the same time?

I'm really confused :S

[AndrewHunter]

No, the program is doing exactly what you are telling it to do. If you want to echo the behavior to the screen just place printf statements everytime you use fprintf. So:

xyz = fopen("example.txt","a");
printf("%s", "12345\n");
fprintf(xyz,"12345\n");
fclose(xyz);

Plus don't forget you want to check your pointer prior to use to ensure it is valid.

[Adak]

No, and you don't want it to, either.

The way it works is, you have a program with output. While you're working on the program, you'll have output sent to the screen, so you can easily check the accuracy and format of the output, easily.

When you're satisfied that your output is OK, then you have it sent to a file. Since the program will be built up (probably), using several functions and blocks of code, the original data will undoubtedly be something you DON'T want to send to anybody - until you have checked it, and know it's accurate.

If you have the printf()'s lines of code working right, it's simple to add the fprintf() lines of code to your program, when you're ready.

Programs that write their output to a file, usually have too much data for a screen, so it's just a nuisance having it go there, once you have the program working well.