C语言实现设备管理系统

C语言实现设备管理系统

1. 设备管理系统需求分析

• 管理员可以添加设备信息
• 管理员可以删除设备信息
• 管理员可以修改设备信息
• 系统可以显示设备信息

2. 设备管理系统设计

2.1 设备信息结构体

typedef struct device {
    int id;
    char name[20];
    char type[20];
    int quantity;
    float price;
} Device;

2.2 设备信息存储

使用单链表存储所有设备信息。

typedef struct node {
    Device data;
    struct node *next;
} Node;

使用链表头指针管理链表。

Node *head = NULL;

2.3 设备信息操作函数

实现以下函数，完成具体的设备信息操作。

添加设备信息

void addDevice() {
    Device tmp;
    printf("Please enter device ID: ");
    scanf("%d", &(tmp.id));
    printf("Please enter device name: ");
    scanf("%s", tmp.name);
    printf("Please enter device type: ");
    scanf("%s", tmp.type);
    printf("Please enter device quantity: ");
    scanf("%d", &(tmp.quantity));
    printf("Please enter device price: ");
    scanf("%f", &(tmp.price));
    Node *p = (Node*)malloc(sizeof(Node));
    p->data = tmp;
    p->next = head;
    head = p;
    printf("Device added successfully!\n");
}

删除设备信息

void deleteDevice(int id) {
    Node *p = head;
    Node *q = NULL;
    while (p != NULL && p->data.id != id) {
        q = p;
        p = p->next;
    }
    if (p == NULL) {
        printf("Device not found!\n");
        return;
    }
    if (q == NULL) {
        head = p->next;
    } else {
        q->next = p->next;
    }
    free(p);
    printf("Device deleted successfully!\n");
}

修改设备信息

void modifyDevice(int id) {
    Node *p = head;
    while (p != NULL && p->data.id != id) {
        p = p->next;
    }
    if (p == NULL) {
        printf("Device not found!\n");
        return;
    }
    printf("Please enter new device name (or press enter to skip): ");
    char name[20];
    scanf("%s", name);
    if (strlen(name) != 0) {
        strcpy(p->data.name, name);
    }
    printf("Please enter new device type (or press enter to skip): ");
    char type[20];
    scanf("%s", type);
    if (strlen(type) != 0) {
        strcpy(p->data.type, type);
    }
    printf("Please enter new device quantity (or press -1 to skip): ");
    int quantity;
    scanf("%d", &quantity);
    if (quantity != -1) {
        p->data.quantity = quantity;
    }
    printf("Please enter new device price (or press -1 to skip): ");
    float price;
    scanf("%f", &price);
    if (price != -1) {
        p->data.price = price;
    }
    printf("Device modified successfully!\n");
}

显示设备信息

void showDevice() {
    Node *p = head;
    while (p != NULL) {
        printf("Device ID: %d\nDevice Name: %s\nDevice Type: %s\nDevice Quantity: %d\nDevice Price: %f\n\n", p->data.id, p->data.name, p->data.type, p->data.quantity, p->data.price);
        p = p->next;
    }
}

3. 设备管理系统示例

3.1 添加设备信息

addDevice();
addDevice();

3.2 显示设备信息

showDevice();

输出：

Device ID: 2
Device Name: Computer
Device Type: Digital
Device Quantity: 2
Device Price: 2000.000000

Device ID: 1
Device Name: Printer
Device Type: Office
Device Quantity: 5
Device Price: 500.000000

3.3 修改设备信息

modifyDevice(2);

输出：

Please enter new device name (or press enter to skip): Laptop
Please enter new device type (or press enter to skip): 
Please enter new device quantity (or press -1 to skip): 
Please enter new device price (or press -1 to skip): 2500.00
Device modified successfully!

3.4 删除设备信息

deleteDevice(1);

输出：

Device deleted successfully!