c语言超市管理系统代码

根据提供的引用内容，以下是一个简单的C语言超市管理系统的代码示例：

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

#define MAX_PRODUCTS 100

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

struct Product products[MAX_PRODUCTS];
int numProducts = 0;

void addProduct() {
    struct Product newProduct;
    printf("Enter product ID: ");
    scanf("%d", &newProduct.id);
    printf("Enter product name: ");
    scanf("%s", newProduct.name);
    printf("Enter product cost: ");
    scanf("%f", &newProduct.cost);
    printf("Enter product price: ");
    scanf("%f", &newProduct.price);
    printf("Enter product stock: ");
    scanf("%d", &newProduct.stock);
    
    products[numProducts] = newProduct;
    numProducts++;
    
    printf("Product added successfully!\n");
}

void displayProducts() {
    printf("Product ID\tProduct Name\tCost\tPrice\tStock\n");
    for (int i = 0; i < numProducts; i++) {
        printf("%d\t\t%s\t\t%.2f\t%.2f\t%d\n", products[i].id, products[i].name, products[i].cost, products[i].price, products[i].stock);
    }
}

void purchaseProduct() {
    int productId, quantity;
    printf("Enter product ID: ");
    scanf("%d", &productId);
    printf("Enter quantity: ");
    scanf("%d", &quantity);
    
    for (int i = 0; i < numProducts; i++) {
        if (products[i].id == productId) {
            if (products[i].stock >= quantity) {
                float totalCost = products[i].cost * quantity;
                float totalPrice = products[i].price * quantity;
                products[i].stock -= quantity;
                printf("Total cost: %.2f\n", totalCost);
                printf("Total price: %.2f\n", totalPrice);
                return;
            } else {
                printf("Insufficient stock!\n");
                return;
            }
        }
    }
    
    printf("Product not found!\n");
}

void menu() {
    int choice;
    do {
        printf("\n-- Supermarket Management System --\n");
        printf("1. Add product\n");
        printf("2. Display products\n");
        printf("3. Purchase product\n");
        printf("4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        
        switch (choice) {
            case 1:
                addProduct();
                break;
            case 2:
                displayProducts();
                break;
            case 3:
                purchaseProduct();
                break;
            case 4:
                printf("Exiting...\n");
                break;
            default:
                printf("Invalid choice! Please try again.\n");
                break;
        }
    } while (choice != 4);
}

int main() {
    menu();
    return 0;
}