编写一个C++程序，随机生成NextDate函数的100条测试用例

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

int NextDate(int year, int month, int day);

int main() {
    srand(time(NULL)); // 设置随机数种子为当前时间

    int year, month, day;
    for (int i = 0; i < 100; i++) {
        // 随机生成年月日
        year = rand() % 100 + 1900; // 1900年到1999年之间
        month = rand() % 12 + 1; // 1月到12月之间
        if (month == 2) { // 2月特殊处理
            if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { // 闰年
                day = rand() % 29 + 1; // 1号到29号之间
            } else { // 平年
                day = rand() % 28 + 1; // 1号到28号之间
            }
        } else if (month == 4 || month == 6 || month == 9 || month == 11) { // 小月
            day = rand() % 30 + 1; // 1号到30号之间
        } else { // 大月
            day = rand() % 31 + 1; // 1号到31号之间
        }

        printf("%d-%02d-%02d -> ", year, month, day);
        NextDate(year, month, day);
        printf("\n");
    }

    return 0;
}

int NextDate(int year, int month, int day) {
    int nextYear, nextMonth, nextDay;
    if (year < 1900 || year > 1999 || month < 1 || month > 12 || day < 1 || day > 31) {
        printf("输入日期不合法\n");
        return -1;
    }

    if (month == 2) { // 2月特殊处理
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { // 闰年
            if (day == 29) {
                nextYear = year;
                nextMonth = 3;
                nextDay = 1;
            } else if (day < 29) {
                nextYear = year;
                nextMonth = month;
                nextDay = day + 1;
            } else {
                printf("输入日期不合法\n");
                return -1;
            }
        } else { // 平年
            if (day == 28) {
                nextYear = year;
                nextMonth = 3;
                nextDay = 1;
            } else if (day < 28) {
                nextYear = year;
                nextMonth = month;
                nextDay = day + 1;
            } else {
                printf("输入日期不合法\n");
                return -1;
            }
        }
    } else if (month == 4 || month == 6 || month == 9 || month == 11) { // 小月
        if (day == 30) {
            nextYear = year;
            nextMonth = month + 1;
            nextDay = 1;
        } else if (day < 30) {
            nextYear = year;
            nextMonth = month;
            nextDay = day + 1;
        } else {
            printf("输入日期不合法\n");
            return -1;
        }
    } else { // 大月
        if (day == 31) {
            if (month == 12) {
                nextYear = year + 1;
                nextMonth = 1;
                nextDay = 1;
            } else {
                nextYear = year;
                nextMonth = month + 1;
                nextDay = 1;
            }
        } else if (day < 31) {
            nextYear = year;
            nextMonth = month;
            nextDay = day + 1;
        } else {
            printf("输入日期不合法\n");
            return -1;
        }
    }

    printf("%d-%02d-%02d\n", nextYear, nextMonth, nextDay);
    return 0;
}