用c语言写一个文具销售管理系统能够完成实现信息录入，在已有信息基础上添加新的记录，删除、修改指定商品编号记录，能够按编号查寻设备，计算当日销售额并注明代码信息

当然可以！下面是一个简单的示例代码，演示了如何实现您提到的功能：

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

struct Product {
    int id;
    char name[50];
    float price;
};

struct SalesRecord {
    int productId;
    int quantity;
};

struct Product products[100];
struct SalesRecord sales[100];
int productCount = 0;
int salesCount = 0;

void addProduct() {
    printf("请输入商品编号: ");
    scanf("%d", &products[productCount].id);
    printf("请输入商品名称: ");
    scanf("%s", products[productCount].name);
    printf("请输入商品价格: ");
    scanf("%f", &products[productCount].price);
    productCount++;
    printf("商品添加成功！\n");
}

void addSales() {
    printf("请输入销售的商品编号: ");
    int productId;
    scanf("%d", &productId);
    printf("请输入销售数量: ");
    int quantity;
    scanf("%d", &quantity);
    
    // 查找商品
    int found = 0;
    for (int i = 0; i < productCount; i++) {
        if (products[i].id == productId) {
            found = 1;
            break;
        }
    }
    
    if (found) {
        sales[salesCount].productId = productId;
        sales[salesCount].quantity = quantity;
        salesCount++;
        printf("销售记录添加成功！\n");
    } else {
        printf("找不到指定的商品编号！\n");
    }
}

void deleteProduct() {
    printf("请输入要删除的商品编号: ");
    int productId;
    scanf("%d", &productId);
    
    int found = 0;
    for (int i = 0; i < productCount; i++) {
        if (products[i].id == productId) {
            // 删除商品
            for (int j = i; j < productCount - 1; j++) {
                products[j] = products[j + 1];
            }
            productCount--;
            found = 1;
            printf("商品删除成功！\n");
            break;
        }
    }
    
    if (!found) {
        printf("找不到指定的商品编号！\n");
    }
}

void modifyProduct() {
    printf("请输入要修改的商品编号: ");
    int productId;
    scanf("%d", &productId);
    
    int found = 0;
    for (int i = 0; i < productCount; i++) {
        if (products[i].id == productId) {
            printf("请输入新的商品名称: ");
            scanf("%s", products[i].name);
            printf("请输入新的商品价格: ");
            scanf("%f", &products[i].price);
            found = 1;
            printf("商品修改成功！\n");
            break;
        }
    }
    
    if (!found) {
        printf("找不到指定的商品编号！\n");
    }
}

void searchProduct() {
    printf("请输入要查找的商品编号: ");
    int productId;
    scanf("%d", &productId);
    
    int found = 0;
    for (int i = 0; i < productCount; i++) {
        if (products[i].id == productId) {
            printf("商品编号: %d\n", products[i].id);
            printf("商品名称: %s\n", products[i].name);
            printf("商品价格: %.2f\n", products[i].price);
            found = 1;
            break;
        }
    }
    
    if (!found) {
        printf("找不到指定的商品编号！\n");
    }
}

void calculateDailySales() {
    float totalSales = 0.0;
    for (int i = 0; i < salesCount; i++) {
        int productId = sales[i].productId;
        int quantity = sales[i].quantity;
        
        // 查找商品
        for (int j = 0; j < productCount; j++) {
            if (products[j].id == productId) {
                float price = products[j].price;
                totalSales += price * quantity;
                break;
            }
        }
    }
    
    printf("当日销售额: %.2f\n", totalSales);
}

int main() {
    int choice;
    
    do {
        printf("\n********** 文具销售管理系统 **********\n");
        printf("1. 添加商品\n");
        printf("2. 添加销售记录\n");
        printf("3. 删除商品\n");
        printf("4. 修改商品信息\n");
        printf("5. 查找商品\n");
        printf("6. 计算当日销售额\n");
        printf("0. 退出系统\n");
        printf("************************************\n");
        printf("请输入操作选项: ");
        scanf("%d", &choice);
        
        switch (choice) {
            case 1:
                addProduct();
                break;
            case 2:
                addSales();
                break;
            case 3:
                deleteProduct();
                break;
            case 4:
                modifyProduct();
                break;
            case 5:
                searchProduct();
                break;
            case 6:
                calculateDailySales();
                break;
            case 0:
                printf("感谢使用文具销售管理系统！\n");
                break;
            default:
                printf("无效的选项，请重新输入！\n");
                break;
        }
    } while (choice != 0);
    
    return 0;
}

这只是一个简单的示例，您可以根据实际需求进行扩展和修改。希望对您有所帮助！