Reading random line from a text file

**helloamuro** · 05-03-2008

The opening and closing seems to be working, but could someone guide or give me a suggestions as to how to store which lines have been used? Perhaps if I stored the indexes?

**vart** · 05-03-2008

Originally Posted by helloamuro

I can't use rewind (I'm familiar with it, but it hasn't been covered in my class) but would just opening and closing the file again be sufficient?

If you cannot use rewind or fseek - then fclose/fopen will do the trick

**vart** · 05-03-2008

Originally Posted by helloamuro

The opening and closing seems to be working, but could someone guide or give me a suggestions as to how to store which lines have been used? Perhaps if I stored the indexes?

You will need 2 dimantional array - to store each line in one member of this array

**helloamuro** · 05-03-2008

Or is there anyway I can just use a flag to tell if the line has been used or not?

**helloamuro** · 05-03-2008

I don't really want to use a 2d array because I have been so often criticized for trying to use them before.

**helloamuro** · 05-03-2008

I currently have this for getting the line number. What could I add to it to prevent the same one from being used again

Code:

while(fgets(temp,100,phraseFile)!=0){
			++count;
		}
		
		fclose(phraseFile);
		fopen("clues.txt", "r");
		line= rand()%count;
		
		while(line--){
			fgets(temp, 100, phraseFile); /*gets line and stores in temp*/
		}

**vart** · 05-03-2008

seems to be ok except
fopen("clues.txt", "r"); - you need to store the return value again

bytheway - if line == 0 you will be left with the last read line in the buffer...

**helloamuro** · 05-03-2008

Would the line ==0 work though if my program is in a loop to be performed three times though? It seems like there could be a change that the first and third rounds of the program could use the same word...

**MacGyver** · 05-03-2008

Originally Posted by Elysia

Otherwise, you can do as MacGyver initially suggested: open the file and read everything into memory and deal with it from there.

Whoa, how did I miss this? Elysia agreed with me for once.

/me writes down the date and time.

**vart** · 05-03-2008

Originally Posted by helloamuro

Would the line ==0 work though if my program is in a loop to be performed three times though? It seems like there could be a change that the first and third rounds of the program could use the same word...

I suppose you need to add line++
before your
while(line--) loop

Thread: Reading random line from a text file

Thread Tools

Search Thread

Display

Similar Threads

Segmentation fault ith g_type_check_class_cast () from /usr/lib/libgobject-2.0.so.0

Formatting a text file...

reading from text file

end of line in text file

Unknown Memory Leak in Init() Function