Thread: why is this program crashing.

  1. #1
    Registered User
    Join Date
    Aug 2011
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    385

    why is this program crashing.

    Code:
    #include<stdio.h>
     
    int main()
    {
        FILE *fp;
        int i[2];
     
        fp=fopen("g:\carr","wb+");
         
        scanf("%d",&i[0]);
        scanf("%d",&i[1]);
        fwrite(i,sizeof(i),2,fp);
    }

  2. #2
    Registered User
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    Aug 2011
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    385
    Got it...Sorry.

  3. #3
    spurious conceit MK27's Avatar
    Join Date
    Jul 2008
    Location
    segmentation fault
    Posts
    8,300
    1) You did not check if fp is NULL.

    2) i is a static array, so sizeof(i) is 2*sizeof(int). Your third arg to fwrite is 2, so that would be an "out of bounds" read.
    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

  4. #4
    Registered User
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    Aug 2011
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    That is one of the reasons, and the other reason is that the file g:\carr was open with another program...

  5. #5
    Registered User
    Join Date
    May 2009
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    3,065
    Because the file fails to be opened!

    Tim S.

    PS "\" needs to be escaped

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