newlines from read file :(

[loobian]

How do I make this reads the new lines in the test.txt file, and display them??????

#include <iostream.h>
#include <fstream.h>

void main()
{
char string[200];
ifstream File;
File.open("test.txt");


while(!File.eof())
{
File >> string ;
cout << string<<" ";

}


}

Thanks!

[Troll_King]

First you must write all programs with this format:

int main()
{
    //code
    return 0;
}

Although main can contain arguements in a slightly different version.

Not too sure about steams but the logic is that you must check each character and test it. If the character is a newline than print the newline. I could do this in C but I'm not familiar with steams nor their encapsulated logic. In plain C you could use fgetc.

[loobian]

Hi there!

Well, I don't like my functions to return value... it's useless in my mind, and experience...

Also, about the streams... very strange, but if you have this in the file:
hello world yo yo test

and you write this code:
if(string=="world")
cout << endl;

then it doesn't work... even the string which displays is supposed to be this word, it just ain't work... don't know what on earth is going on

[Troll_King]

Main will return a value even if you do not specify one, so you might as well specify what value you want it to return. A zero represents sucessful completion. Likewise if you write an exit funtion than it should return a non zero.

To find this substring within the string you need to use a function such as strstr(...). I think this is the right function. It returns a pointer to the substring if found. Otherwise it returns a value representing no substring, likely NULL.

[loobian]

hi there!

well, i made the test...

it founds words, but don't find \n ... any ideas?

[Troll_King]

int main()
{
	char c;

	FILE *fptr = fopen("c:\\file.txt","r");

	while((c = fgetc(fptr))!= EOF)
	{
		if (c == '\n') printf("\\n");
		printf("%c", c);
	
	}
	fclose(fptr);
	return 0;
}

[loobian]

ain't work... compile, but gives error when i run it

[Troll_King]

Works on my computer. You have to name the textfile:

file.txt

And put it on the C drive. Here is an example of the file:

This is the file.
I just hit the return key.
This works.

[loobian]

wow, worked now... the last time, i removed the path, because the file was in the dir where my .cpp and exe are... but when i put the path, it works...

but do you know how to do that in C++ code???

[Troll_King]

To validate the file pointer. To see if the file opened correctly. After you open the file in the code write this:

if(fptr == NULL) printf("File did not open");

NULL means that the file did not open. It is the error return status of fopen(...);

[Troll_King]

but do you know how to do that in C++ code???

I have learned a significant amount of C++ in the last 4 months, but believe it or not, steams are one of the only chapters that I have not read yet. So basically the answer is no, not yet.

[loobian]

oh, i see...

well, thanks anyway! It helps a lot!!!!

[Troll_King]

But just a note. The C functions are stronger for FILE IO. Or so many advanced programmers claim.