c - How to use fscanf, care about endofline? -

i want read int file

the first line composed of 1 int , second of 2

ie

 1  2 3 

if

 fscanf(file, "%d \n %d %d", &a, &b, &c); 

i obtain correctly 3 numbers if put numbers on same line in file ie 1 2 3

i obtain same result (and that's not want)

i want know : how force user go new line in file ?

edit : seems unclear (i'm sorry that) want file

1  2 3 

produce result :

a = 1 b = 2  c = 3  

and file

1 2 3  

produce either error or

a = 1 b = 0 c = 0 

fscanf(file, "%d", ...); first scans , discard white space before scanning int characters. in scanning white-space, both ' ' , '\n' treated same, using '%d' loses end-of-line.

fscanf(file, "\n", ...); , fscanf(file, " ", ...); same thing: scan , discard any white space. using "\n" not scan '\n'.

code use fscanf(file, "%d%*1[\n]%d %d", &a, &b, &c) == 3, find '\n' after a, additional '\n' lurking in other places.

the way using scanf() family detect '\n' involves using '%c' or '%[]' or '%n'. easier use fgets() , parse sscanf() or strtol().

int read1and2int(file *stream, int *a, int *b, int *c) {    char buf[100];    int n;     if (fgets(buf, sizeof buf, stream) == null) return eof;    int count = sscanf(buf,"%d %n", a, &n);    // non-numeric or data    if (count != 1 || buf[n]) return 0;     if (fgets(buf, sizeof buf, stream) == null) return 1;    count = sscanf(buf,"%d%d %n", b, c, &n);    // non-numeric or data    if (count != 2 || buf[n]) return 1;    return 3;  }