c语言链表实现超大十进制数的加法，但是输出不出结果，请问有什么问题？

Question

c语言链表实现超大十进制数的加法，但是输出不出结果，请问有什么问题？

#include<stdio.h>
#include<malloc.h>
typedef struct PolyArray
{
    int coef;
    int exp;
}PolyArray;
typedef struct PolyNode
{
    PolyArray data;
    struct PolyNode* next;
}PolyNode;
void IntArray(PolyArray** array)
{
FILE* fp;
    char str[] = "D:\\visualstudio\\数据结构作业\\input.txt";
    fopen_s(&fp, str, "rt");
    if (!fp)
{
        printf("open file error");
}
    int* i = NULL;
    i[0] = 0, i[1] = 0;
    char c = '\0';
    if (fp)
{
        while(array)
{
            while (c = fgetc(fp))
{
                (*array)[*i].coef = c - '0';
                (*array)[*i].exp = *i;
(*i)++;
                if (c == '\n')
{
                    array++;
i++;
}
}
}
fclose(fp);
}
}
void CreatePoly(PolyNode** head, int m, PolyArray* array)
{
    PolyNode* prev = NULL;
    *head = (PolyNode*)malloc(sizeof(PolyNode));
    if ((*head))
        (*head)->next = NULL;
    for (int i = 0; i < m; i++)
{
        PolyNode* p = (PolyNode*)malloc(sizeof(PolyNode));
        if (p)
{
            p->data.coef = array[i].coef;
            p->data.exp = array[i].exp;
            p->next = NULL;
            if (!prev)
{
prev = *head;
}
            prev->next = p;
prev = p;
}
}
}
 
int ComparePoly(PolyNode* a, PolyNode* b)
{
    if (a->data.exp < b->data.exp)
        return 1;
    else if (a->data.exp > b->data.exp)
        return -1;
    else return 0;
}
 
PolyNode* AddPoly(PolyNode* ha, PolyNode* hb, PolyNode* hc)
{
PolyNode* p, * q, * newp, * newh;
    p = ha->next;
    q = hb->next;
newh = hc;
    while (p && q)
{
        switch (ComparePoly(p, q))
{
        case 1:
            newh->next = p;
newh = p;
            p = p->next;
            break;
        case -1:
            newh->next = q;
newh = q;
            q = q->next;
            break;
        case 0:
            int sum = p->data.coef + q->data.coef;
            int remain = sum % 10;
            if (sum != 0.0)
{
                newp = (PolyNode*)malloc(sizeof(PolyNode));
                if (newp)
{
                    newp->data.coef = remain;
                    newp->data.exp = q->data.exp;
                    newp->next = NULL;
                    newh->next = newp;
                    newp->data.coef = newp->data.coef + (sum - (sum % 10)) / 10;
newh = newp;
}
}
            p = p->next;
            q = q->next;
            break;
}
}
    newh->next = p ? p : q;
    return hc;
}
void ExchangePoly(PolyNode* head)
{
PolyNode* p, * q, * tmp;
    p = (PolyNode*)malloc(sizeof(PolyNode));
    q = (PolyNode*)malloc(sizeof(PolyNode));
    tmp = (PolyNode*)malloc(sizeof(PolyNode));
    p = head->next;
    while (p)
{
        q = p->next;
        while (q)
{
            if (q->data.exp > p->data.exp)
{
                if (tmp)
{
                    tmp->data = p->data;
                    p->data = q->data;
                    q->data = tmp->data;
}
}
            q = q->next;
}
        p = p->next;
}
}
void PrintPoly(FILE* fp, PolyNode* head)
{
ExchangePoly(head);
    PolyNode* s = head->next;
    while (s)
{
        printf("(%d %d)\n", s->data.coef, s->data.exp);
        fprintf(fp, "(%d,%d)\n", s->data.coef, s->data.exp);
        s = s->next;
}
}
 
int main()
{
FILE* fp;
    char str[] = "D:\\visualstudio\\数据结构作业\\input.txt";
PolyNode* ha, * hb, * hc;
    PolyArray** array = NULL;
    if (array)
{
        array[0] = (PolyArray*)malloc(sizeof(PolyArray) * 128);
        array[1] = (PolyArray*)malloc(sizeof(PolyArray) * 128);
}
    IntArray(array);
    fopen_s(&fp, str, "at");
    if (!fp)
{
        printf("open file error");
        return 0;
}
    CreatePoly(&ha, 12, array[0]);
    CreatePoly(&hb, 12, array[1]);
    hc = (PolyNode*)malloc(sizeof(PolyNode));
AddPoly(ha, hb, hc);
PrintPoly(fp, hc);
    free(ha);
    free(hb);
    free(hc);
    free(array[0]);
    free(array[1]);
fclose(fp);
 
    return 0;
}
 

Answer 1

 
PolyArray** array = NULL;
    if (array)
{
        array[0] = (PolyArray*)malloc(sizeof(PolyArray) * 128);
        array[1] = (PolyArray*)malloc(sizeof(PolyArray) * 128);
}
 

这个if代码块就是废代码啊，array肯定是NULL啊

int* i = NULL;
    i[0] = 0, i[1] = 0;
 

这代码也是错的，马上崩溃了啊。i指针你没分配空间啊！！！就开始赋值啊

Answer 2

请问我的这个代码怎么改？

Answer 3

 
```c
 int x = 0, c[128], j = 0;
    if (fp)
{
        while (x < 2)
{
            fscanf_s(fp, "%1d", &c[j]);
            (*array)[j].coef = c[j];
            (*array)[j].exp = j + 1;
            printf("%d", (*array)[j].coef);
            j++;
            if (*c == '\n')
{
                array++;
x++;
}
}
        fclose(fp);
}
 

这么修改了之后，输入的全是乱码

```