#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

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
    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!
      int days[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
      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";
      //We might have rejected Feb. 29 in a leap year! So we would also need a lepayear function, etc.
    }
  }
  system("pause");
  return 0;
} //main