Reading Through Files

[PLC]

I cant seem to remember.. lets say i have a file that has the following data:

123 890 321
321 123 678
345 123 432

i only want to read the first set of digits from each row and store them in a int.

123
321
345

after i read the first 3 digits, and it hits the first space... how do i tell it to move to the next line? fseek?

any help would be great.

[linuxdude]

you could fgets

fgets(buffer,sizeof buffer,fp);
sscanf(buffer, "%d %d %d", &buffer[0],&buffer[1],&buffer[2]);

where buffer is a character array ex

char buffer[BUFSIZ];

then you have all three does that help

[Hammer]

>>sscanf(buffer, "%d %d %d", &buffer[0],&buffer[1],&buffer[2]);
I presume you meant
sscanf(buffer, "%d", &myint);
or better yet use strtol().

[linuxdude]

I got the whole first row. I figured he could deal with it that way in a two dimentional array. I just showed him a one dimension and see if he wanted to use it

[Hammer]

I got the whole first row. I figured he could deal with it that way in a two dimentional array. I just showed him a one dimension and see if he wanted to use it

... but you've used the same variable to read from and write to.
>>sscanf(buffer, "%d %d %d", &buffer[0],&buffer[1],&buffer[2]);

[linuxdude]

oh whoops sorry didn't mean to here is the way to do it

int info[BUFSIZ];
int parsed_info[BUFSIZ];

fgets(info,sizeof info,fp);
sscanf(info,"%d %d %d",&parsed_info[0],&parsed_info[1],&parsed_info[2]);

thanx hammer

[gooddevil]

i dont know anything about the way the previous answers work.but according to the syntax of them all u can use them only in conditions where ur matrix contains all elements that r 3 digits. but if u want to generalize it i suggest using code something like this

while((ch=fgetc(fp))!=EOF)//read till the end of file
{
	if(ch!=' ')//if ch is not equal to space
	p[i++]=ch;//add it to an character array 
	else
	{
		while(ch!='\n' && ch!=EOF)//go to the end of line
		ch=fgetc(fp);
		static int j=0;// so that j is 0 only the first time
		b[j++]=atoi(p);//convert the char array to an integer
	}
	// and remember to keep the final val of j
	// it is required to know the length of b
}

hey and one more thing i have not checked this code. wrote it just on the fly. if there r some errors just tell me. but my idea is to give u a general idea that is all. i think this thing should work with a matrix of any dimension (given the array u declare is sufficiently large). good luck