segmentation fault in C program for finding if sudoku is wrong or right

This is a discussion on segmentation fault in C program for finding if sudoku is wrong or right within the C Programming forums, part of the General Programming Boards category; #include<stdio.h> #include<math.h> int main() { int t,count=1,i,j,k,n,z,l,p; int a[100][100]; scanf("%d",&t); for(count=1;count<=t;count++) { scanf("%d",&n); for(i=0;i<n;i++) for(j=0;j<n;j++) scanf("%d",&a[i][j]); for(i=0;i<n;i++) { z=0;k=0; for(j=0;j<n;j++) ...

  1. #1
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    Post segmentation fault in C program for finding if sudoku is wrong or right

    #include<stdio.h>
    #include<math.h>
    int main()
    {
    int t,count=1,i,j,k,n,z,l,p;
    int a[100][100];
    scanf("%d",&t);
    for(count=1;count<=t;count++)
    {
    scanf("%d",&n);
    for(i=0;i<n;i++)
    for(j=0;j<n;j++)
    scanf("%d",&a[i][j]);
    for(i=0;i<n;i++)
    {
    z=0;k=0;
    for(j=0;j<n;j++)
    z=z+a[i][j];
    if(z==(n*(n-1))/2)
    k=1;
    }
    for(j=0;j<n;j++)
    {
    z=0;l=0;
    for(i=0;i<n;i++)
    z=z+a[i][j];
    if(z==(n*(n-1))/2)
    l=1;
    }
    for(i=0;i<sqrt(n);i+=sqrt(n))
    {
    z=0;
    for(j=0;j<sqrt(n);i+=sqrt(n))
    z=z+a[i][j];
    if(z==(n*(n-1))/2)
    p=1;
    }
    if(k==1&&l==1&&p==1)
    printf("YES\n");
    else
    printf("NO\n");
    }
    return 0;
    }
    Last edited by Salem; 09-25-2012 at 02:35 PM. Reason: restored

  2. #2
    qny
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    Code:
     ... for(j=0;j<sqrt(n);i+=sqrt(n)) ...
    maybe here: loop with j, but incrementing i

  3. #3
    and the hat of wrongness Salem's Avatar
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    Learn how to use a debugger.
    Code:
    $ gcc -g foo.c -lm
    $ ./a.out 
    1
    3
    1 2 3
    4 5 6
    7 8 9
    Segmentation fault
    $ gdb ./a.out 
    GNU gdb (Ubuntu/Linaro 7.3-0ubuntu2) 7.3-2011.08
    Copyright (C) 2011 Free Software Foundation, Inc.
    License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
    This is free software: you are free to change and redistribute it.
    There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
    and "show warranty" for details.
    This GDB was configured as "x86_64-linux-gnu".
    For bug reporting instructions, please see:
    <http://bugs.launchpad.net/gdb-linaro/>...
    Reading symbols from /home/sc/Documents/a.out...done.
    (gdb) run
    Starting program: /home/sc/Documents/a.out 
    1
    3
    1 2 3
    4 5 6
    7 8 9
    
    Program received signal SIGSEGV, Segmentation fault.
    0x0000000000400831 in main () at foo.c:34
    34	                                z=z+a[i][j];
    (gdb) print z
    $1 = -725259189
    (gdb) print i
    $2 = 110
    (gdb) print j
    $3 = 0
    (gdb)
    Mmm, i = 110
    That doesn't look like a valid subscript.
    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.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  4. #4
    and the hat of wrongness Salem's Avatar
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    Mmmm. is this your homework profile?
    Kiss Your Weekend Goodbye - Cheezburger
    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.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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