使用C语言编写，一个销售管理系统，要求：某公司有四个销售员（编号：1-4），负责销售五种产品（编号：1-5）。每个销售员都将 当天出售的每种产品各写一张便条交上来。每张便条包含内容：销售员的代号，产品的代 号，这种产品的当天的销售额；每位销售员每天可能上缴0-5张便条。完成以下功能： 1）计算上个月每个人每种产品的销售额。 2）按销售额对销售员进行排序，输出排序结果（销售员代号） 3）统计每种产品的总销售额，对这些产品按从高到底的顺序，输出排序结果（需输出 产品的代号和销售额） 4）输出统计报表。你只需要回答完整的代码

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

#define SALESMAN_NUM 4
#define PRODUCT_NUM 5

typedef struct {
    int salesman_id;
    int product_id;
    double sales;
} SalesRecord;

typedef struct {
    double total_sales[PRODUCT_NUM];
    double total_sales_per_salesman[SALESMAN_NUM][PRODUCT_NUM];
} SalesReport;

void calculate_sales_report(SalesRecord *records, int num_records, SalesReport *report) {
    memset(report, 0, sizeof(SalesReport));
    for (int i = 0; i < num_records; i++) {
        int salesman_id = records[i].salesman_id;
        int product_id = records[i].product_id;
        double sales = records[i].sales;
        report->total_sales[product_id - 1] += sales;
        report->total_sales_per_salesman[salesman_id - 1][product_id - 1] += sales;
    }
}

void sort_salesman_by_sales(SalesReport *report, int *sorted_salesman) {
    double total_sales[SALESMAN_NUM];
    for (int i = 0; i < SALESMAN_NUM; i++) {
        total_sales[i] = 0;
        for (int j = 0; j < PRODUCT_NUM; j++) {
            total_sales[i] += report->total_sales_per_salesman[i][j];
        }
    }
    for (int i = 0; i < SALESMAN_NUM; i++) {
        int max_index = i;
        for (int j = i + 1; j < SALESMAN_NUM; j++) {
            if (total_sales[j] > total_sales[max_index]) {
                max_index = j;
            }
        }
        if (max_index != i) {
            int temp = sorted_salesman[i];
            sorted_salesman[i] = sorted_salesman[max_index];
            sorted_salesman[max_index] = temp;
        }
    }
}

void sort_product_by_sales(SalesReport *report, int *sorted_products) {
    double total_sales[PRODUCT_NUM];
    for (int i = 0; i < PRODUCT_NUM; i++) {
        total_sales[i] = report->total_sales[i];
    }
    for (int i = 0; i < PRODUCT_NUM; i++) {
        int max_index = i;
        for (int j = i + 1; j < PRODUCT_NUM; j++) {
            if (total_sales[j] > total_sales[max_index]) {
                max_index = j;
            }
        }
        if (max_index != i) {
            int temp = sorted_products[i];
            sorted_products[i] = sorted_products[max_index];
            sorted_products[max_index] = temp;
        }
    }
}

void print_sales_report(SalesReport *report) {
    printf("Sales report:\n");
    printf("Sales by salesman:\n");
    printf("Salesman ID\tProduct 1\tProduct 2\tProduct 3\tProduct 4\tProduct 5\n");
    for (int i = 0; i < SALESMAN_NUM; i++) {
        printf("%d\t\t", i + 1);
        for (int j = 0; j < PRODUCT_NUM; j++) {
            printf("%.2f\t\t", report->total_sales_per_salesman[i][j]);
        }
        printf("\n");
    }
    printf("Sales by product:\n");
    printf("Product ID\tTotal sales\n");
    for (int i = 0; i < PRODUCT_NUM; i++) {
        printf("%d\t\t%.2f\n", i + 1, report->total_sales[i]);
    }
}

int main() {
    SalesRecord records[100];
    int num_records = 0;
    while (1) {
        int salesman_id, product_id;
        double sales;
        printf("Enter sales record (salesman_id product_id sales): ");
        scanf("%d %d %lf", &salesman_id, &product_id, &sales);
        if (salesman_id == 0 || product_id == 0 || sales == 0) {
            break;
        }
        records[num_records].salesman_id = salesman_id;
        records[num_records].product_id = product_id;
        records[num_records].sales = sales;
        num_records++;
    }
    SalesReport report;
    calculate_sales_report(records, num_records, &report);
    int sorted_salesman[SALESMAN_NUM] = {1, 2, 3, 4};
    sort_salesman_by_sales(&report, sorted_salesman);
    printf("Salesman sorted by sales (highest first):\n");
    printf("Salesman ID\n");
    for (int i = 0; i < SALESMAN_NUM; i++) {
        printf("%d\n", sorted_salesman[i]);
    }
    int sorted_products[PRODUCT_NUM] = {1, 2, 3, 4, 5};
    sort_product_by_sales(&report, sorted_products);
    printf("Products sorted by sales (highest first):\n");
    printf("Product ID\n");
    for (int i = 0; i < PRODUCT_NUM; i++) {
        printf("%d\n", sorted_products[i]);
    }
    print_sales_report(&report);
    return 0;
}

注：这个代码仅供参考，可能存在一些细节问题需要特别注意。