c语言家庭财务管理系统

以下是一个简单的C语言家庭财务管理系统的例子：

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

// 定义一个结构体来存储财务信息
struct finance {
    char type[20]; // 收入或支出类型
    float amount; // 金额
    char date[20]; // 日期
    char note[50]; // 备注
};

// 定义一个链表节点
struct node {
    struct finance data;
    struct node *next;
};

// 定义一个全局变量，指向链表头节点
struct node *head = NULL;

// 添加财务信息
void add_finance() {
    struct finance f;
    printf("请输入收入或支出类型：");
    scanf("%s", f.type);
    printf("请输入金额：");
    scanf("%f", &f.amount);
    printf("请输入日期：");
    scanf("%s", f.date);
    printf("请输入备注：");
    scanf("%s", f.note);

    // 创建一个新节点
    struct node *new_node = (struct node*)malloc(sizeof(struct node));
    new_node->data = f;
    new_node->next = NULL;

    // 如果链表为空，将新节点作为头节点
    if (head == NULL) {
        head = new_node;
    }
    // 否则将新节点插入到链表末尾
    else {
        struct node *p = head;
        while (p->next != NULL) {
            p = p->next;
        }
        p->next = new_node;
    }

    printf("添加成功！\n");
}

// 查询财务信息
void query_finance() {
    if (head == NULL) {
        printf("暂无财务信息！\n");
        return;
    }

    printf("请输入要查询的日期：");
    char date[20];
    scanf("%s", date);

    struct node *p = head;
    int count = 0;
    float total = 0;
    while (p != NULL) {
        if (strcmp(p->data.date, date) == 0) {
            printf("%s\t%.2f\t%s\t%s\n", p->data.type, p->data.amount, p->data.date, p->data.note);
            count++;
            total += p->data.amount;
        }
        p = p->next;
    }

    if (count == 0) {
        printf("未查询到财务信息！\n");
    }
    else {
        printf("共查询到%d条财务信息，总金额为%.2f元。\n", count, total);
    }
}

// 删除财务信息
void delete_finance() {
    if (head == NULL) {
        printf("暂无财务信息！\n");
        return;
    }

    printf("请输入要删除的日期：");
    char date[20];
    scanf("%s", date);

    struct node *p = head;
    struct node *prev = NULL;
    int count = 0;
    float total = 0;
    while (p != NULL) {
        if (strcmp(p->data.date, date) == 0) {
            if (prev == NULL) {
                head = p->next;
            }
            else {
                prev->next = p->next;
            }
            printf("%s\t%.2f\t%s\t%s\n", p->data.type, p->data.amount, p->data.date, p->data.note);
            free(p);
            count++;
            total += p->data.amount;
            p = prev == NULL ? head : prev->next;
        }
        else {
            prev = p;
            p = p->next;
        }
    }

    if (count == 0) {
        printf("未查询到财务信息！\n");
    }
    else {
        printf("共删除了%d条财务信息，总金额为%.2f元。\n", count, total);
    }
}

// 修改财务信息
void modify_finance() {
    if (head == NULL) {
        printf("暂无财务信息！\n");
        return;
    }

    printf("请输入要修改的日期：");
    char date[20];
    scanf("%s", date);

    struct node *p = head;
    int count = 0;
    float total = 0;
    while (p != NULL) {
        if (strcmp(p->data.date, date) == 0) {
            printf("%s\t%.2f\t%s\t%s\n", p->data.type, p->data.amount, p->data.date, p->data.note);
            printf("请输入新的收入或支出类型：");
            scanf("%s", p->data.type);
            printf("请输入新的金额：");
            scanf("%f", &p->data.amount);
            printf("请输入新的日期：");
            scanf("%s", p->data.date);
            printf("请输入新的备注：");
            scanf("%s", p->data.note);
            printf("修改成功！\n");
            count++;
            total += p->data.amount;
        }
        p = p->next;
    }

    if (count == 0) {
        printf("未查询到财务信息！\n");
    }
    else {
        printf("共修改了%d条财务信息，总金额为%.2f元。\n", count, total);
    }
}

// 统计财务信息
void statistics_finance() {
    if (head == NULL) {
        printf("暂无财务信息！\n");
        return;
    }

    struct node *p = head;
    int count = 0;
    float income = 0;
    float expense = 0;
    while (p != NULL) {
        if (strcmp(p->data.type, "收入") == 0) {
            income += p->data.amount;
        }
        else {
            expense += p->data.amount;
        }
        count++;
        p = p->next;
    }

    printf("共统计了%d条财务信息，其中收入%.2f元，支出%.2f元，净收入%.2f元。\n", count, income, expense, income - expense);
}

int main() {
    int choice;
    while (1) {
        printf("家庭财务管理系统\n");
        printf("1.添加财务信息\n");
        printf("2.查询财务信息\n");
        printf("3.删除财务信息\n");
        printf("4.修改财务信息\n");
        printf("5.统计财务信息\n");
        printf("6.退出系统\n");
        printf("请选择操作：");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_finance();
                break;
            case 2:
                query_finance();
                break;
            case 3:
                delete_finance();
                break;
            case 4:
                modify_finance();
                break;
            case 5:
                statistics_finance();
                break;
            case 6:
                printf("谢谢使用！\n");
                exit(0);
            default:
                printf("无效的选择，请重新输入！\n");
                break;
        }
    }

    return 0;
}