Making fscanf Ignore Optional Parameter

Posted by adi92 on Stack Overflow See other posts from Stack Overflow or by adi92
Published on 2008-10-29T04:32:21Z Indexed on 2010/05/08 13:48 UTC
Read the original article Hit count: 172

Filed under:

c

|

scanf

I am using fscanf to read a file which has lines like
Number <-whitespace-> string <-whitespace-> optional_3rd_column

I wish to extract the number and string out of each column, but ignore the 3rd_column if it exists

Example Data:
12 foo something
03 bar
24 something #randomcomment

I would want to extract 12,foo; 03,bar; 24, something while ignoring "something" and "#randomcomment"

I currently have something like

while(scanf("%d %s %*s",&num,&word)>=2)
{ 
assign stuff 
}

However this does not work with lines with no 3rd column. How can I make it ignore everything after the 2nd string?

Related posts about scanf

Scanf with Signals

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a signal that blocks SIGINT and basically says "Sorry, you can't quit.\n" The issue is this can occur during a scanf. When this occurs during a scanf, scanf takes in the printf as input. How can I do a printf that will cause scanf to basically hit the enter key automatically. I don't care… >>> More
Using an ampersand in scanf()

as seen on Stack Overflow - Search for 'Stack Overflow'
When I compile scanf("%s", &var);, gcc sends back a warning: warning: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘char (*)[20]’ however when I compile scanf("%s", var);, no warning is applied. Both pieces of code work and the book I am reading specifically says to use the ampersand… >>> More
Disadvantages of scanf

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi all, I want to know the disadvantage of the scanf.In many of a sites I have read that using scanf will cause buffer overflow some times.What is the reason for that , and is there any other drawbacks with scanf . >>> More
scanf password in c

as seen on Stack Overflow - Search for 'Stack Overflow'
i want to scanf password from user in c language on linux platform,so that no one can see it. >>> More
Looking for Go equivalent of scanf.

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm looking for the Go equivalent of scanf(). I tried with following code: 1 package main 2 3 import ( 4 "scanner" 5 "os" 6 "fmt" 7 ) 8 9 func main() { 10 var s scanner.Scanner 11 s.Init(os.Stdin) 12 s.Mode = scanner.ScanInts 13 tok := s.Scan() … >>> More

Developer IT