Thread: About text file I/O

Hi! I'm relatively new at programming so I'm having a bit of a problem.

My first question is, how do I print out long strings with spaces from a text file? I tried printing it out the normal way but only the first word gets printed out. My professor required us to print out bible passages from a text file.

For my second question, I have this code:

Code:

fp=fopen("Score.txt", "r");
for(i=0;i<30;i++){
fscanf(fp,"%s\n%s\n\n",scorename[i],scorescore[i]);
printf("%s\n%s\n\n",scorename[i],scorescore[i]);
}

It's supposed to print out the scores stored in Score.txt. But say, I have only one score recorded. It prints out 29 junk data for the rest. I'm planning on replacing 30 with n so that it will print only the correct number of scores. But my problem is, how can I keep track of the number of scores inside the text file? I need to retain this even when restarting the program.

fscanf returns a result - you should check it for success.

You read the manual page for fscanf

You then do
SomeKindOfTypeName result = fscanf.....

You then do
if ( result == SomethingYouReadInTheManual )

Presumably, you read something to figure out what %d etc means. Just keep reading the same thing.

If you want to get the number of scores in a file try the followings.

Code:

#include<stdio.h>
int main()
{
        FILE *fp=popen("wc -l score.txt","r");
        int n;
        fscanf(fp,"%d",&n);
        printf("%d\n",n);
}

wc-l will return the number of lines in a file.
popen will return the file pointer which is having the output of wc- l score.txt.
Then get the number of lines using that file pointer.
So finally 'n' will have the number of lines in a file.
Then use that 'n' value in your for loop.

just a final note on fscanf:

fscanf, reads a word and then another one.
so if you have a file like:

Message From File
EOF

and you use fscanf two times, you get first
'Message' then 'From'. but if you have four
'fscanf's then you get all the words. so fscanf
reads a word and proceeds to the next one,
when encountered the end of the line, it goes
to the next one and gets the word of that line.
hope it helped.