edaBit-coding-challenges/24Hour-Time/code.cpp

/*  Write a function that receives the time in 12-hour AM/PM format 
 *  and returns a string representation of the time in military (24-hour) 
 *  format.
 *  Midnight is 12:00:00AM on a 12-hour clock, and 00:00:00 on a 24-hour clock.
 *  Noon is 12:00:00PM on a 12-hour clock, and 12:00:00 on a 24-hour clock.
 */
std::string convertTime(std::string str) {
	//  create substr of first 2 characters in string
	int cCheck = std::stoi (str.substr(0,2));
	//  if cCheck is 12, set it equal to 0. Now AM or PM will show correctly. URHMHUMPH!!!
	if (12 == cCheck){
		cCheck = 0;
	}	
	//  use the substr for conditional if/else to see if 12 needs to be added
	//  use AM/PM to see if it needs to be modified.
	if(str.substr(8,2)== "PM"){
		cCheck += 12;
	}
	//  if cCheck is one digit, add a leading zero
	if(cCheck<10){
  	str.replace(0,2,"0" + std::to_string(cCheck));
	}
	//  otherwise cCheck is a two digit replacement
	else 	{
		str.replace(0,2,std::to_string(cCheck));
		}
return str.substr(0,8);
}