Compiler won't take #<stdlib.h>

This is a discussion on Compiler won't take #<stdlib.h> within the C Programming forums, part of the General Programming Boards category; I'm trying to make a guess the number program, and I've come up with this: Code: #include <stdio.h> #include <stdlib.h> ...

  1. #1
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    Compiler won't take #<stdlib.h>

    I'm trying to make a guess the number program, and I've come up with this:
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    
    int main()
    {
     int a;
     int b;
     b=randomize(10);
     printf("%d\n",b);
     printf("Enter number: ");
     scanf("%d", &a);
     while (a != b)
              {
               printf("Wrong! Try again: ");
               scanf("%d", &a);
              }
    printf("Congratulations! You guessed right!");
    getchar();
    getchar();
    }
    However, when I compile and I click the "linker" tab in the bottom of the screen I see the following messages:
    Code:
    d:\documents and settings\pim\mijn documenten\c\guessnum.o(.text+0x75):guessnum.c: undefined reference to `randomize'
    I'm using the Bloodshed Dev C++ compiler, version 4.

    Could anyone tell me what I have done wrong here?

    Thank You.

  2. #2
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    isn't the function called rand()?

  3. #3
    and the hat of wrongness Salem's Avatar
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    > Compiler won't take #<stdlib.h>
    Which has nothing to do with the problem.

    Your problem is a linker error message, and the real reason for the problem is randomize isn't a standard function.

    Your choices are
    srand() - to seed the generator
    rand() - to get the next pseudo-random value
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  4. #4
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    I was using this website.
    Anyway did I understand correctly that: srand will take a new semirandom value and "give" that to rand()? And how would I use srand() and rand() together? I don't think this page is very clear.
    Last edited by omnificient; 12-11-2007 at 12:29 PM.

  5. #5
    Its hard... But im here swgh's Avatar
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    Code:
    /*seed the number*/
    srand((unsigned)time(0));
    
    /*create a random number*/
    int num = rand() &#37; 5 + 1;
    I'm just trying to be a better person - My Name Is Earl

  6. #6
    and the hat of sweating
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    Looks like that page was using Turbo C, which apparently has a lot of non-standard crap in it.

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