c语言 求两个多项式的和(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加,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。（5）先输入非零项的个数，再输入每一对非零项系数和指数。（6）输出和的每一对非零项系数和指数

好的，我会根据您的要求进行回答，下面是代码实现：

#include <stdio.h>
#include <stdlib.h>

// 定义多项式的结构体
typedef struct PolyNode {
    int coef;  // 系数
    int expon; // 指数
    struct PolyNode* next;
} PolyNode, *Polynomial;

// 多项式输入函数
Polynomial readPoly() {
    Polynomial p, rear, t;
    int c, e;
    p = (Polynomial)malloc(sizeof(PolyNode));
    p->next = NULL;
    rear = p;
    scanf("%d %d", &c, &e);
    while (c != 0) {
        t = (Polynomial)malloc(sizeof(PolyNode));
        t->coef = c;
        t->expon = e;
        rear->next = t;
        rear = t;
        scanf("%d %d", &c, &e);
    }
    rear->next = NULL;
    return p;
}

// 多项式相加函数
Polynomial addPoly(Polynomial p1, Polynomial p2) {
    Polynomial front, rear, temp;
    int sum;
    rear = (Polynomial)malloc(sizeof(PolyNode));
    front = rear;
    while (p1 && p2) {
        if (p1->expon == p2->expon) {
            sum = p1->coef + p2->coef;
            if (sum) {
                temp = (Polynomial)malloc(sizeof(PolyNode));
                temp->coef = sum;
                temp->expon = p1->expon;
                rear->next = temp;
                rear = temp;
            }
            p1 = p1->next;
            p2 = p2->next;
        }
        else if (p1->expon > p2->expon) {
            temp = (Polynomial)malloc(sizeof(PolyNode));
            temp->coef = p1->coef;
            temp->expon = p1->expon;
            rear->next = temp;
            rear = temp;
            p1 = p1->next;
        }
        else {
            temp = (Polynomial)malloc(sizeof(PolyNode));
            temp->coef = p2->coef;
            temp->expon = p2->expon;
            rear->next = temp;
            rear = temp;
            p2 = p2->next;
        }
    }
    while (p1) {
        temp = (Polynomial)malloc(sizeof(PolyNode));
        temp->coef = p1->coef;
        temp->expon = p1->expon;
        rear->next = temp;
        rear = temp;
        p1 = p1->next;
    }
    while (p2) {
        temp = (Polynomial)malloc(sizeof(PolyNode));
        temp->coef = p2->coef;
        temp->expon = p2->expon;
        rear->next = temp;
        rear = temp;
        p2 = p2->next;
    }
    rear->next = NULL;
    temp = front;
    front = front->next;
    free(temp);
    return front;
}

// 多项式输出函数
void printPoly(Polynomial p) {
    if (p) {
        printf("%d %d", p->coef, p->expon);
        p = p->next;
        while (p) {
            printf(" %d %d", p->coef, p->expon);
            p = p->next;
        }
    }
    printf("\n");
}

int main() {
    Polynomial p1, p2, p;
    int n1, n2;
    printf("请输入第一个多项式的非零项个数：");
    scanf("%d", &n1);
    printf("请输入第一个多项式每一项的系数和指数：");
    p1 = readPoly();
    printf("第一个多项式为：");
    printPoly(p1);
    printf("请输入第二个多项式的非零项个数：");
    scanf("%d", &n2);
    printf("请输入第二个多项式每一项的系数和指数：");
    p2 = readPoly();
    printf("第二个多项式为：");
    printPoly(p2);
    p = addPoly(p1, p2);
    printf("相加后的多项式为：");
    printPoly(p);
    return 0;
}

这段代码实现了多项式的输入、相加和输出功能，您只需要输入非零项的个数以及每一项的系数和指数，就可以得到两个多项式的和的每一对非零项系数和指数。