柔性数组

#include <stdio.h>#include <malloc.h>typedef struct _soft_array{    int len;    int array[];}SoftArray;SoftArray* create_soft_array(int size){    SoftArray* ret = NULL;        if( size > 0 )    {        ret = (SoftArray*)malloc(sizeof(*ret) + sizeof(*(ret->array)) * size);                ret->len = size;    }        return ret;}void fac(SoftArray* sa){    int i = 0;        if( NULL != sa )    {        if( 1 == sa->len )        {           sa->array[0] = 1;        }        else         {            sa->array[0] = 1;            sa->array[1] = 1;                        for(i=2; i<sa->len; i++)            {                sa->array[i] = sa->array[i-1] + sa->array[i-2];            }        }    } }void delete_soft_array(SoftArray* sa){    free(sa);}int main(){    int i = 0;    SoftArray* sa = create_soft_array(10);        fac(sa);        for(i=0; i<sa->len; i++)    {        printf("%d\n", sa->array[i]);    }        delete_soft_array(sa);        return 0;}