SoloLearn Code Coach solution for Military Time in C++

military_time.cpp

#include <iostream>
#include <string>
using namespace std;

int main() {
	string twelve_hr_str;
	string initial_hr;
	int new_hr;
	string final_24_str;

	getline(cin, twelve_hr_str);

	if (twelve_hr_str.find("PM") != string::npos) {
		if (twelve_hr_str.length() == 8) {
			initial_hr = twelve_hr_str.substr(0,2);
			new_hr = stoi(initial_hr) + 12;
			final_24_str = to_string(new_hr) + twelve_hr_str.substr(2,4);
		} else {
			initial_hr = twelve_hr_str.substr(0,1);
			new_hr = stoi(initial_hr) + 12;
			final_24_str = to_string(new_hr) + twelve_hr_str.substr(1,4);
		}
	} else {
		if (twelve_hr_str.length() == 8) {
			final_24_str = twelve_hr_str.substr(0,5);
		} else {
			final_24_str = "0" + twelve_hr_str.substr(0,5);
		}
	}

	cout << final_24_str << endl;

	return 0;
}