Question

我正在审核此代码：

#include <stdio.h>
#include <gsl/gsl_rng.h>
#include <gsl/gsl_randist.h>
#include <gsl/gsl_permutation.h>



int main ( ) {
    const long N = 10;
    const gsl_rng_type *T = NULL;
    gsl_rng *r = NULL;

    gsl_permutation *p = NULL;
    p = gsl_permutation_alloc ( N );
    gsl_permutation *q = NULL;
    q = gsl_permutation_alloc ( N );

    gsl_rng_env_setup ();
    T = gsl_rng_default;
    r = gsl_rng_alloc ( T );

    printf ( "initial permutation: " );
    gsl_permutation_init ( p );
    gsl_permutation_fprintf ( stdout, p, " %u" );
    printf ( "\n" );

    printf (" random permutation:");  
    gsl_ran_shuffle (r, p->data, N, sizeof(size_t));
    gsl_permutation_fprintf (stdout, p, " %u");
    printf ("\n");

    printf ( "inverse permutation: " );
    gsl_permutation_inverse ( q, p );
    gsl_permutation_fprintf ( stdout, q, "%u" );
    printf ( "\n" );

    gsl_permutation_free ( p );
    gsl_permutation_free ( q );

    return 0;
}

当我尝试编译它时，我得到未处理的异常：访问冲突写入位置错误。我相信，我为所有指针分配了内存但是，错误仍然存在。我不太熟悉C所以，任何输入都将不胜感激。附：当我使用调试器时，它指向这一行：gsl_permutation_fprintf ( stdout, p, " %u" ); 感谢

编辑：我玩过代码并意识到问题可能出现在stdout语句中。

Answer 1

不应该首先调用gsl_rng_env_setup ();吗？你以前做了几个gsl_permutation_alloc。

访问冲突写入位置错误

1 个答案: