The power of scanf()This tip submitted by Joanna on 2006-12-20 01:54:31. It has been viewed 90205 times.
Rating of 5.9 with 612 votes
Assume we have: char a;
To read a string:
scanf("%[^\n]\n", a); // it means read until you meet '\n', then trash that '\n'
To read till a coma:
scanf("%[^,]", a); // this one doesn't trash the coma
scanf("%[^,],",a); // this one trashes the coma
If you want to skip some input, use * sign after %. For example you want to read last name from "John Smith" :
scanf("%s %s", temp, last_name); // typical answer, using 1 temporary variable scanf("%s", last_name); scanf("%s", last_name); // another answer, only use 1 variable, but calls scanf twice scanf("%*s %s", last); // best answer, because you don't need extra temporary variable nor calling scanf twice
By the way, you should be very careful with using scanf because of the potential to overflow your input buffer! Generally you should consider using fgets and sscanf rather than just scanf itself, using fgets to read in a line and then sscanf to parse that line as demonstrated above.
Help your fellow programmers! Add a tip!