void insert(PolyNode **head, int coef, int expon) { Term *new_node = (PolyNode*)malloc(sizeof(PolyNode)); new_node->coef = coef; new_node->expon = expon; new_node->next = *head; *head = new_node; } void print_poly(PolyNode *head) { PolyNode *p = head; while (p != NULL) { if (p->coef > 0) { printf("+"); } printf("%dx^%d", p->coef, p->expon); p = p->next; } } void print_poly_desc(PolyNode *head) { PolyNode *p = head; int count = 0; while (p != NULL) { count++; p = p->next; } PolyNode *arr[count]; p = head; int i = 0; while (p != NULL) { arr[i] = p; p = p->next; i++; } for (int j = 0; j < count; j++) { for (int k = j + 1; k < count; k++) { if (arr[j]->expon < arr[k]->expon) { PolyNode *temp = arr[j]; arr[j] = arr[k]; arr[k] = temp; } } if (arr[j]->coef > 0) { printf("+"); } printf("%dx^%d", arr[j]->coef, arr[j]->expon); } }
时间: 2024-01-18 21:05:17 浏览: 28
这段代码定义了两个函数,`insert` 和 `print_poly_desc`,分别用于向多项式中插入一项和按指数从大到小输出多项式。
函数 `insert` 的参数是一个二级指针 `head`,表示多项式的头指针。函数中创建一个新的多项式节点,并将其插入到链表的头部。
函数 `print_poly` 的参数是一个一级指针 `head`,表示多项式的头指针。函数中遍历多项式链表,按照一定的格式输出多项式每一项的系数和指数。
函数 `print_poly_desc` 的参数也是一个一级指针 `head`,表示多项式的头指针。函数中首先遍历多项式链表,计算链表中节点的个数,并将所有节点保存到一个数组中。然后,按照指数从大到小的顺序对数组进行排序,并输出多项式每一项的系数和指数。
需要注意的是,函数 `print_poly` 和 `print_poly_desc` 都使用了 `if (p->coef > 0) { printf("+"); }` 这行代码,是为了在系数为正数时输出加号。
相关问题
/*主函数模块*/ int main() { H=AddPolylist(); ComputePolylist(H); OutputPolylist(H); DestroyPolylist(H); return 0; } /* 请在这里填写答案 */ /*单链表模块*/ void InitPolylist(Polylist *L) { } Polylist CreatePolylist()/*输入多项式的系数和指数,用尾插法建立一元多项式的链表*/ { } int LengthPolylist(Polylist L) { } void OutputPolylist(Polylist L) { } Polylist AddPolylist()/*创建两个多项式并相加,完成后显示序列*/ { } void ComputePolylist(Polylist L)/*计算多项式在x=%d的值*/ { } void DestroyPolylist(Polylist L) { }
/*主函数模块*/
int main() {
Polylist H;
H = AddPolylist();
ComputePolylist(H);
OutputPolylist(H);
DestroyPolylist(H);
return 0;
}
/*单链表模块*/
void InitPolylist(Polylist *L) {
*L = (Polylist)malloc(sizeof(struct PolyNode));
(*L)->next = NULL;
}
Polylist CreatePolylist()/*输入多项式的系数和指数,用尾插法建立一元多项式的链表*/ {
Polylist L, rear, t;
int c, e;
InitPolylist(&L);
rear = L;
scanf("%d", &c);
scanf("%d", &e);
while(e != -1) {
t = (Polylist)malloc(sizeof(struct PolyNode));
t->coef = c;
t->expon = e;
t->next = NULL;
rear->next = t;
rear = t;
scanf("%d", &c);
scanf("%d", &e);
}
return L;
}
int LengthPolylist(Polylist L) {
int len = 0;
while(L->next) {
len++;
L = L->next;
}
return len;
}
void OutputPolylist(Polylist L) {
int len = LengthPolylist(L);
printf("%d ", len);
L = L->next;
while(L) {
printf("%d %d ", L->coef, L->expon);
L = L->next;
}
printf("\n");
}
Polylist AddPolylist()/*创建两个多项式并相加,完成后显示序列*/ {
Polylist A, B, C, rear;
int lenA, lenB, sum;
A = CreatePolylist();
B = CreatePolylist();
InitPolylist(&C);
rear = C;
while(A->next && B->next) {
if(A->next->expon > B->next->expon) {
rear->next = A->next;
A = A->next;
} else if(A->next->expon < B->next->expon) {
rear->next = B->next;
B = B->next;
} else {
sum = A->next->coef + B->next->coef;
if(sum) {
A->next->coef = sum;
rear->next = A->next;
A = A->next;
B = B->next;
} else {
A = A->next;
B = B->next;
}
}
rear = rear->next;
}
while(A->next) {
rear->next = A->next;
A = A->next;
rear = rear->next;
}
while(B->next) {
rear->next = B->next;
B = B->next;
rear = rear->next;
}
return C;
}
void ComputePolylist(Polylist L)/*计算多项式在x=%d的值*/ {
int x, sum = 0;
scanf("%d", &x);
while(L->next) {
sum += L->next->coef * pow(x, L->next->expon);
L = L->next;
}
printf("%d\n", sum);
}
void DestroyPolylist(Polylist L) {
Polylist temp;
while(L) {
temp = L;
L = L->next;
free(temp);
}
}
c语言 求两个多项式的乘积(1)编写函数实现一个多项式的输入,返回多项式链表的头指针。(2)编写函数实现两个多项式相乘,返回结果多项式链表的头指针。(3)编写函数输出一个多项式的二元组序列。(4)在main函数中分别调用上述函数,实现输入两个多项式,先输入多项式非零项的个数,再输入每一对非零项系数和指数。输出乘积的系数和指数。
好的,我来为你解答。
首先,我们需要定义一个多项式的结构体,包含系数和指数两个成员:
```c
typedef struct polyNode{
int coef; // 系数
int expon; // 指数
struct polyNode *next; // 指向下一个节点的指针
} PolyNode, *Polynomial;
```
接下来,我们就可以编写题目要求的函数了。
1. 实现多项式的输入
```c
Polynomial createPoly() {
Polynomial head = (Polynomial)malloc(sizeof(PolyNode));
head->next = NULL;
PolyNode *tail = head;
int n, coef, expon;
printf("请输入多项式非零项的个数:");
scanf("%d", &n);
for (int i = 0; i < n; i++) {
printf("请输入第%d项的系数和指数:", i+1);
scanf("%d%d", &coef, &expon);
PolyNode *p = (PolyNode*)malloc(sizeof(PolyNode));
p->coef = coef;
p->expon = expon;
p->next = NULL;
tail->next = p;
tail = p;
}
return head;
}
```
2. 实现两个多项式的相乘
```c
Polynomial polyMultiply(Polynomial p1, Polynomial p2) {
Polynomial head = (Polynomial)malloc(sizeof(PolyNode));
head->next = NULL;
PolyNode *tail = head;
for (PolyNode *t1 = p1->next; t1 != NULL; t1 = t1->next) {
for (PolyNode *t2 = p2->next; t2 != NULL; t2 = t2->next) {
int coef = t1->coef * t2->coef;
int expon = t1->expon + t2->expon;
PolyNode *p = (PolyNode*)malloc(sizeof(PolyNode));
p->coef = coef;
p->expon = expon;
p->next = NULL;
// 将新节点插入到结果多项式中
// 如果指数相同,则合并同类项
for (PolyNode *t = head->next; t != NULL; t = t->next) {
if (t->expon == expon) {
t->coef += coef;
break;
} else if (t->next == NULL || t->next->expon < expon) {
p->next = t->next;
t->next = p;
break;
}
}
}
}
return head;
}
```
3. 实现多项式的输出
```c
void printPoly(Polynomial p) {
for (PolyNode *t = p->next; t != NULL; t = t->next) {
printf("(%d,%d)", t->coef, t->expon);
if (t->next != NULL) printf(" -> ");
}
printf("\n");
}
```
最后,在主函数中调用上述函数即可:
```c
int main() {
Polynomial p1, p2, result;
printf("请输入第一个多项式:\n");
p1 = createPoly();
printf("请输入第二个多项式:\n");
p2 = createPoly();
result = polyMultiply(p1, p2);
printf("乘积的系数和指数:");
printPoly(result);
return 0;
}
```
以上就是完整的代码实现。