用C++中的sscanf赋值

有人能指出，如果存在的话，我的代码中的错误导致了这个问题，我花了很多时间来解决这个问题，而且我对C++编程真的很陌生
因此bool valid_str检查字符串是否有效，因此有效日期格式为ex:2016-07-08/01:00，无效为20167-8/01:00
在具有字符串的Date构造函数中，如果格式无效，则分配给所有0。如果有效，那么将其分配给变量，这只是一段大代码，但我自己的想法是，我把sscanf搞砸了，因此得到了RunTimeError(我使用Linux(。我用对了吗？

bool valid_str(const std::string& str)
{
int len = str.size();
if (len != 16)
return false;
if (str[4] != '-')
return false;
if (str[7] != '-')
return false;
if (str[10] != '/')
return false;
if (str[13] != ':')
return false;
for (int i = 0; i < 4; i++) {
if (str[i] < '0' || str[i] > '9')
return false;
}
for (int i = 5; i < 7; i++) {
if (str[i] < '0' || str[i] > '9')
return false;
}
for (int i = 8; i < 10; i++) {
if (str[i] < '0' || str[i] > '9')
return false;
}
for (int i = 11; i < 13; i++) {
if (str[i] < '0' || str[i] > '9')
return false;
}
for (int i = 14; i < 16; i++) {
if (str[i] < '0' || str[i] > '9')
return false;
}
return true;
}
//Date Constructor
Date::Date(const std::string& dateString)
{
std::string str;
if (valid_str(dateString) == false) {
this->m_year = 0;
this->m_month = 0;
this->m_day = 0;
this->m_hour = 0;
this->m_minute = 0;
}
else {
sscanf(dateString.c_str(), "%4d-%2d-%2d/%2d:%2d",
&m_year,
&m_month,
&m_day,
&m_hour,
&m_minute);
}
}  

(已编辑(完整代码：

#include "Date.hpp" 
//#include <initializer_list> 
//#include <string> 
#include <iomanip>
#include <stdio.h>
//using namespace std;
//bool valid_str(std::string &);
Date::Date(){ } //default constructor 
/**
* @brief constructor with arguments
*/
Date::Date(int t_year, int t_month, int t_day, int t_hour, int t_minute) {
m_year = t_year; 
m_month = t_month; 
m_day = t_day; 
m_hour = t_hour; 
m_minute = t_minute; 
}
bool valid_str(const std::string& str) { 
int len = str.size(); 
if(len != 16) 
return false; 
if(str[4] != '-') 
return false; 
if(str[7] != '-') 
return false; 
if(str[10] != '/') 
return false; 
if(str[13] != ':') 
return false; 
for(int i = 0 ; i < 4 ; i++) { 
if(str[i] < '0' || str[i] > '9') 
return false; 
} 
for(int i = 5 ; i < 7 ; i++) { 
if(str[i] < '0' || str[i] > '9') 
return false; 
} 
for(int i = 8 ; i < 10 ; i++) { 
if(str[i] < '0' || str[i] > '9') 
return false;
} 
for(int i = 11 ; i < 13 ; i++) { 
if(str[i] < '0' || str[i] > '9') 
return false; 
} 
for(int i = 14 ; i < 16 ; i++) { 
if(str[i] < '0' || str[i] > '9') 
return false; 
} 
return true; 
}

/**
* @brief constructor with a string
*/
Date::Date(const std::string &dateString)
{ 
std::string str;
if(valid_str(dateString) == false) {
this->m_year = 0; 
this->m_month = 0; 
this->m_day = 0; 
this->m_hour = 0; 
this->m_minute = 0; 
} else{ 
sscanf(dateString.c_str(), "%4d-%2d-%2d/%2d:%2d",
&m_year,
&m_month,
&m_day,
&m_hour,
&m_minute);
}
}
int Date::getYear(void) const
{
return m_year;
}
void Date::setYear(const int t_year){
m_year = t_year;
}
int Date::getMonth(void) const{
return m_month;
}
void Date::setMonth(const int t_month){
m_month = t_month;
}
int Date::getDay(void) const{
return m_day;
}
void Date::setDay(const int t_day){
m_day = t_day;
}
int Date::getHour(void) const{
return m_hour;
}
void Date::setHour(const int t_hour){
m_hour = t_hour;
}
int Date::getMinute(void) const{
return m_minute;
}
void Date::setMinute(const int t_minute){
m_minute = t_minute;
}
int leapYear(int y){
if (y % 400 == 0)
return 1;
if (y %4 == 0 && y % 100 == 0){
return 1;
}else 
return 0;
}
bool Date::isValid(const Date &t_date){
int x[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
x[1] += leapYear(t_date.m_year);
if(t_date.m_year < 1000 || t_date.m_year > 9999){
return false;
}else if (t_date.m_month < 1 || t_date.m_month > 12){
return false;
}else if(t_date.m_day < 1 || t_date.m_day > x[t_date.m_month - 1]){
return false;
}else if(t_date.m_hour > 24 || t_date.m_hour < 0){
return false;
}else if(t_date.m_minute > 59 || t_date.m_minute < 0){
return false;
}else return true;
}
/**
*  @brief overload the assign operator
*/
Date& Date::operator=(const Date &t_date){
this->m_year = t_date.m_year;
this->m_month = t_date.m_month;
this->m_day = t_date.m_day;
this->m_hour = t_date.m_hour;
this->m_minute = t_date.m_minute;
}
/**
* @brief check whether the CurrentDate is  greater than the t_date
*/
bool Date::operator>(const Date &t_date) const{
if(this->m_year > t_date.m_year){
return true;
}else if(this->m_month > t_date.m_month){
return true;
}else if(this->m_day > t_date.m_day){
return true;
}else if(this->m_hour > t_date.m_hour){
return true;
}else if(this->m_minute > t_date.m_minute){
return true;
}else return false;
}
/**
* @brief check whether the CurrentDate is  less than the t_date
*/
bool Date::operator<(const Date &t_date) const{
if(this->m_year < t_date.m_year){
return true;
}else if(this->m_month < t_date.m_month){
return true;
}else if(this->m_day < t_date.m_day){
return true;
}else if(this->m_hour < t_date.m_hour){
return true;
}else if(this->m_minute < t_date.m_minute){
return true;
}else return false;
}

/**
* @brief check whether the CurrentDate is  greater or equal than the t_date
*/
bool Date::operator>=(const Date &t_date) const{
if (*this > t_date || *this == t_date)
return true;
else
return false;
}

/**
* @brief check whether the CurrentDate is  less than or equal to the t_date
*/
bool Date::operator<=(const Date &t_date) const{
if (*this < t_date || *this == t_date)
return true;
else
return false;
}
/**
* @brief check whether the CurrentDate is equal to the t_date
*/
bool Date::operator==(const Date &t_date) const{
if (this->m_year == t_date.m_year)
return true;
if (this->m_month == t_date.m_month)
return true;
if (this->m_day == t_date.m_day)
return true;
if (this->m_hour == t_date.m_hour)
return true;
if (this->m_minute == t_date.m_minute)
return true;
return false;
}

Date Date::stringToDate(const std::string &t_dateString){
int y = 0, m = 0, d = 0, h = 0, mm = 0;
sscanf(t_dateString.c_str(), "%d-%d-%d/%d:%d", y, m, d, h, mm);
return Date(y, m, d, h, mm);
}
std::string Date::dateToString(const Date &t_date){
char c[30];
sscanf(c, "%4d-%2d-%2d/%2d:%2d", t_date.m_year, t_date.m_month, t_date.m_day, t_date.m_hour, t_date.m_minute);
return std::string(c);
}