Windows popup: X.exe has stopped working (Code::Blocks)

问题

thanks in advance for taking a look at this.

I'm getting a Windows error message when I try to run this program I wrote in C in Code::Blocks. The funny thing is it compiles fine, and if I lower the upper bound of what I'm testing the program runs fine as well.

Details:

When I try to run the program, first I get a Windows popup that says "X.exe has stopped working. Windows is checking for a solution to the problem". Shortly this changes to "X.exe has stopped working. A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available. (Close program)" I click the close program button, and then I see the command prompt that says "Process returned 255 <0xFF> execution time 3.940 s Press any key to continue".

I have Windows 8.

I'm using the GNU GCC compiler.

If I change "upto" to 100000, the program works fine.

Here's the code:

/************************************************
* Finds the starting integer under 1000000 that
* produces the longest Collatz sequence, and the
* length of said sequence.
*************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <limits.h>
#define upto 1000000

int main()
{
    long i;
    long long j;
    long long max = LONG_LONG_MAX;
    long length = 0;
    long number = 0;
    long penull = 0;
    long len[upto];
    for (i = 0; i < upto; i++) (len[i] = 0);
    // counts length of Collatz sequence for starting integers from 1 to 999999
    for (i = 1; i < upto; i++)
    {
        j = i;
        while (j != 1)
        {
            assert (j <= (max - 1)/3);
            if (j%2 == 0) (j = j/2);
            else (j = 3*j + 1);
            len[i]++;
            if (j < i)
            {
                len[i] = len[i] + len[j];
                j = 1;
            }
        }
        // stores length of the longest sequence and the starting integer producing it
        if (len[i] > length)
            {
                length = len[i];
                number = i;
            }
        // stores a duplicate length for later comparison
        else if (len[i] == length) (penull = len[i]);
    }
    if (length == penull) (printf("There are at least two!"));
    else printf("%ld produces a Collatz sequence of length %ld", number, length + 1);
    return 0;
}

回答1:

Move the array len outside the main function. The size of the stack is sometimes limited, and local variables are stored on the stack. By moving it outside, you make it a global variable.

来源：https://stackoverflow.com/questions/19868448/windows-popup-x-exe-has-stopped-working-codeblocks

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