用数据与结构写多项式相乘

好的，以下是一个示例的 C 语言代码，用于实现多项式相乘：

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

#define MAX_DEGREE 10

typedef struct {
    int degree;
    int coeff[MAX_DEGREE + 1];
} Polynomial;

void init_poly(Polynomial *poly) {
    int i;
    for (i = 0; i <= MAX_DEGREE; i++) {
        poly->coeff[i] = 0;
    }
    poly->degree = 0;
}

void read_poly(Polynomial *poly) {
    printf("Enter the degree of the polynomial: ");
    scanf("%d", &poly->degree);
    printf("Enter the coefficients of the polynomial from highest to lowest degree: ");
    int i;
    for (i = poly->degree; i >= 0; i--) {
        scanf("%d", &poly->coeff[i]);
    }
}

void display_poly(Polynomial poly) {
    int i;
    printf("%d", poly.coeff[poly.degree]);
    for (i = poly.degree - 1; i >= 0; i--) {
        if (poly.coeff[i] != 0) {
            printf(" + %d*x^%d", poly.coeff[i], i);
        }
    }
    printf("\n");
}

Polynomial multiply_poly(Polynomial poly1, Polynomial poly2) {
    Polynomial result;
    init_poly(&result);

    if (poly1.degree + poly2.degree > MAX_DEGREE) {
        printf("Error: Degree of resulting polynomial exceeds max degree\n");
        exit(EXIT_FAILURE);
    }

    int i, j;
    for (i = 0; i <= poly1.degree; i++) {
        for (j = 0; j <= poly2.degree; j++) {
            result.coeff[i+j] += poly1.coeff[i] * poly2.coeff[j];
        }
    }

    result.degree = poly1.degree + poly2.degree;

    return result;
}

int main() {
    Polynomial poly1, poly2, result;
    init_poly(&poly1);
    init_poly(&poly2);
    init_poly(&result);

    printf("Enter the first polynomial:\n");
    read_poly(&poly1);
    printf("Enter the second polynomial:\n");
    read_poly(&poly2);

    result = multiply_poly(poly1, poly2);

    printf("\nResult:\n");
    display_poly(result);

    return 0;
}

这个示例程序定义了一个“多项式”结构体，并实现了一些常用的多项式操作函数，例如“初始化多项式”、“读取多项式”、“显示多项式”和“相乘多项式”。程序创建了两个多项式，并使用相乘多项式函数将它们相乘，然后打印结果。