#include<iostream>
#include<string>
using namespace std;
int getInteger(string s) {
  int result=-1;
  try {
    result=stoi(s);
  }
  catch(invalid_argument&) {
    //do nothing, result is still -1 
  }
  return result;
}//getInteger
bool leapYear(int yr) {
  bool leap=false;
  if(yr%4==0) leap=true;
  if(yr%100==0 && yr%400!=0) leap=false;
  cout<<leap<<endl;
  return leap;
}//leapYear

int main(void) {
  string input;
  int month,day,year;
  cout<<"Enter the date as mm/dd/year:";
  cin>>input; //Example: 10/31/2016
  int p=input.find_first_of("/"); // Using example: p=2
  if(p<0) cout<<"not a valid date\n";
  else {
    month=getInteger(input.substr(0,p)); //Using example: month=10
    input=input.substr(p+1); //Using example: input="31/2016"
    p=input.find_first_of("/"); //Using example: p=2
    if(p<0) cout<<"not a valid date\n";
    else {
      day=getInteger(input.substr(0,p)); //Using example: day=31
      input=input.substr(p+1); //Using example: input="2016"
      year=getInteger(input); //Using example: year=2016
      if(month<0 || month>12 || day<0 || day>31 || year<0) 
        cout<<"not a valid date\n";
      else { //We have 3 integers, it still might not be a valid date!
        cout<<"You entered month="<<month<<" day="<<day<<" year="<<year<<endl;
        int days[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
        if(leapYear(year)) days[2]=29;
        string months[]={"","January","February","March","April","May","June",
          "July","August","September","October","November","December"};
        if(day>days[month])  cout<<"There are not that many days in "<<months[month]<<"\n";
        else cout<<"There are "<<days[month]<<" days in "<<months[month]<<".\n";
      } //second slash found
  }//first slash found
  system("pause");
  return 0;
} //main