Thread: Quick check on reading in + using strings

  1. #1
    Registered User
    Join Date
    Jul 2008

    Quick check on reading in + using strings


    I've been writing some C programs with the scanf funciton and wondered if there was an easier way to input data. I need functions which can:

    1. Identify set areas in strings (e.g. is the [x]th letter in a 1?)
    2. Read in strings (e.g. if I want to enter 1234 into an array num[4] it can place each number into each array space, so num[0]=1..... num[3]=4)
    3. Count the length of a string (e.g. the string "cisfun" is 6 characters long)

    4. I need to know how spaces and new-line characters (presing the enter key) are handled

    I'm only using the command line.


  2. #2
    spurious conceit MK27's Avatar
    Join Date
    Jul 2008
    segmentation fault
    1) not exactly, but look at strtok and strchr. Also string[x] will be xth letter, of course. I don't know what's in it.
    2)Wow, there's a good project for you to work on. 6 lines or less. Simple, honest.
    4)the ascii value of a space is 32, and a newline is 10.
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

  3. #3
    Registered User
    Join Date
    Sep 2007
    Just a note: Except in special cases, 32 and 10 should not be used to represent space and newline in C. Instead, ' ' and '\n' are preferred, for a couple of reasons: No magic numbers, so it's obvious what they stand for; portable to non-ASCII systems.

    If you're writing, say, a charset converter, then it's absolutely necessary to know the values of various characters in various charsets; but for a simple C program, portable constructs should be used.

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