C in general

This is a discussion on C in general within the C Programming forums, part of the General Programming Boards category; hi all sorry I couldn't find a precise title.. I'm new to C I usually write in JAVA or Visual ...

  1. #1
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    C in general

    hi all

    sorry I couldn't find a precise title..
    I'm new to C I usually write in JAVA or Visual basics 6, so there are a few things I want to ask you about, I know some questions might seem silly:

    1- suppose you have the string "2004004", how can you convert this to a "long" value? in general is there a way in C to convert from Strings to int or long or double?

    2-when reading for a txt file, I used the following code:

    fscanf(fileName," %s %s %s ", nm, fm, un);
    //nm fm and un are string variables so no problem here

    if I do this iteratively shouldn't I get the next lines in the file until the feof?

    3-I went over the basics in C but I didn't read anything concerning graphics...Is there a way to create GUIs in C? if so can you point me to an online tutorial?

    4- and also about random number: how do we generate random numbers?


    thanks

  2. #2
    Gawking at stupidity
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    You can use strtol() to convert from string to long, and you can use strtod() to convert from string to double.
    If you understand what you're doing, you're not learning anything.

  3. #3
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    that's weird...I have the string.h library in front of me but I couldn't find these functions

    thanks a lot

  4. #4
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    Quote Originally Posted by majoub
    that's weird...I have the string.h library in front of me but I couldn't find these functions

    thanks a lot

    Check <stdlib.h>

    Regards,

    Dave

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