有人能解释一下为什么以下代码段会导致分段错误(core dumped)吗?我确定我有一个游离指针或者其他问题,但是我找不到它。任何帮助都将不胜感激。我正在尝试创建一个归并排序函数。
int* mergesort(int* num, int n)
{
int *left, *right;
int middle = n/2;
if (n <= 1)
return num;
//split array into two halves each with elements of 0...middle-1 and middle...n-1 correspondingly
split(num, n, &left, &right, middle);
left = mergesort(left, middle);
right = mergesort(right, n-middle);
merge(num, left, right, middle, n-middle);
free(left);
free(right);
return num;
}
void split( int* num, int n, int** left, int** right, int middle)
{
left = #
right = &num + middle;
}
int* merge (int* num, int* left, int* right, int sizeLeft, int sizeRight)
{
int i, j, k, n;
i = j = k = 0;
n = sizeLeft + sizeRight;
while (k < n)
{
if (i < sizeLeft)
{
if (j < sizeRight)
{
insert(num, left, right, &i, &j, &k);
}
else
{
append(num, left, sizeLeft, &i, &k);
}
}
else
{
append (num, right, sizeRight, &j, &k);
}
}
}
void insert(int* num, int* left, int* right, int* i, int* j, int*k)
{
if (left[*i] < right[*j])
{
num[*k] = left[*i];
(*i)++;
}
else
{
num[*k] = right[*j];
(*j)++;
}
(*k)++;
}
void append(int* num, int* half, int sizeHalf, int* i, int* k)
{
while (*i < sizeHalf)
{
num[*k] = half[*i];
(*i)++; (*k)++;
}
}