财务管理系统简单版2

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

struct Transaction {
    char date[11];
    char category[21];
    double amount;
};

// 添加一条交易记录
void addRecord(struct Transaction* records, int* count) {
    struct Transaction trans;
    printf("请输入交易日期（格式：YYYY-MM-DD）：");
    scanf("%s", trans.date);
    printf("请输入交易类别：");
    scanf("%s", trans.category);
    printf("请输入交易金额：");
    scanf("%lf", &trans.amount);
    while (trans.amount <= 0) {
        printf("错误：金额必须为正数，请重新输入：");
        scanf("%lf", &trans.amount);
    }
    records[*count] = trans;
    (*count)++;
    printf("交易记录已添加。\n");
}

// 查找交易记录
int searchRecord(struct Transaction* records, int count, char* date, char* category) {
    for (int i = 0; i < count; i++) {
        if (strcmp(records[i].date, date) == 0 && strcmp(records[i].category, category) == 0) {
            return i;
        }
    }
    return -1;
}

// 删除一条交易记录
void deleteRecord(struct Transaction* records, int* count) {
    char date[11], category[21];
    printf("请输入要删除的交易日期（格式：YYYY-MM-DD）：");
    scanf("%s", date);
    printf("请输入要删除的交易类别：");
    scanf("%s", category);
    int index = searchRecord(records, *count, date, category);
    if (index == -1) {
        printf("错误：未找到符合条件的交易记录。\n");
    } else {
        for (int i = index; i < *count - 1; i++) {
            records[i] = records[i + 1];
        }
        (*count)--;
        printf("交易记录已删除。\n");
    }
}

// 修改一条交易记录
void modifyRecord(struct Transaction* records, int count) {
    char date[11], category[21];
    printf("请输入要修改的交易日期（格式：YYYY-MM-DD）：");
    scanf("%s", date);
    printf("请输入要修改的交易类别：");
    scanf("%s", category);
    int index = searchRecord(records, count, date, category);
    if (index == -1) {
        printf("错误：未找到符合条件的交易记录。\n");
    } else {
        printf("请输入修改后的交易日期（原值为 %s）：", records[index].date);
        scanf("%s", records[index].date);
        printf("请输入修改后的交易类别（原值为 %s）：", records[index].category);
        scanf("%s", records[index].category);
        printf("请输入修改后的交易金额（原值为 %.2f）：", records[index].amount);
        scanf("%lf", &records[index].amount);
        while (records[index].amount <= 0) {
            printf("错误：金额必须为正数，请重新输入：");
            scanf("%lf", &records[index].amount);
        }
        printf("交易记录已修改。\n");
    }
}

// 显示交易记录列表
void showRecords(struct Transaction* records, int count) {
    const int DATE_WIDTH = 12;
    const int CATEGORY_WIDTH = 20;
    const int AMOUNT_WIDTH = 12;
    printf("%*s%*s%*s\n", DATE_WIDTH, "日期", CATEGORY_WIDTH, "类别", AMOUNT_WIDTH, "金额");
    for (int i = 0; i < count; i++) {
        printf("%*s%*s%*.2f\n", DATE_WIDTH, records[i].date, CATEGORY_WIDTH, records[i].category, AMOUNT_WIDTH, records[i].amount);
    }
}

// 统计支出
double totalExpense(struct Transaction* records, int count) {
    double total = 0;
    for (int i = 0; i < count; i++) {
        if (records[i].amount < 0) {
            total += -records[i].amount;
        }
    }
    return total;
}

// 统计收入
double totalIncome(struct Transaction* records, int count) {
    double total = 0;
    for (int i = 0; i < count; i++) {
        if (records[i].amount > 0) {
            total += records[i].amount;
        }
    }
    return total;
}

int main() {
    struct Transaction records[100];
    int count = 0;
    while (1) {
        printf("请选择操作：\n");
        printf("1. 添加交易记录\n");
        printf("2. 删除交易记录\n");
        printf("3. 修改交易记录\n");
        printf("4. 显示交易记录\n");
        printf("5. 统计支出\n");
        printf("6. 统计收入\n");
        printf("0. 退出程序\n");
        int choice;
        scanf("%d", &choice);
        switch (choice) {
        case 1:
            addRecord(records, &count);
            break;
        case 2:
            deleteRecord(records, &count);
            break;
        case 3:
            modifyRecord(records, count);
            break;
        case 4:
            showRecords(records, count);
            break;
        case 5:
            printf("总支出为：%.2f\n", totalExpense(records, count));
            break;
        case 6:
            printf("总收入为：%.2f\n", totalIncome(records, count));
            break;
        case 0:
            printf("程序已退出。\n");
            return 0;
        default:
            printf("错误：无效的选择，请重新输入。\n");
        }
    }
    return 0;
}

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