IMT1031 Grunnleggende Programmering - Obligatorisk oppgave 3

grprog_oblig3.cpp

#include <iostream>
using namespace std;

//pre-declare methods used in the program
int menu ();
bool legal (int distance);
void race (int distance, int lap);
bool rerun ();
float timeToFloat (int m, int s, int h);
void floatToTime (float h);


//main, where all our methods are initialized and controlled from
int main () {
	//declare variables
	const int lapLength = 400;	//how long a lap is, to determine total laps
	int raceLength;				//the total length of the intended race
	bool done = false;			//program exits when true

	//welcome message
	cout << "Velkommen til tidtakerprogrammet!\n";

	while (!done){	//runs races until the user is done
		raceLength = menu ();			//runs menu to dertermine race length
		race (raceLength, lapLength);	//runs the race until its done
		done = rerun ();				//asks the user whether to rerun
	}

	//farewell message
	cout << "\n\nHa en fin dag!";
}

//the menu() asks for the length of the race and makes sure it is valid
int menu () {
	//declare variables
	int inInt;	//variable for storing integer input

	while (true) {	//runs until a legal race length is obtained

		cout << "\n\nVennligst tast inn distansen som skal gåes: \n";
		cin >> inInt;	//reads the proposed distance

		//sends the proposed distance to legal() to check validity
		if (legal(inInt)) { return inInt; }
		else { cout << "\n" << inInt << " er en ugyldig distanse!\n"; }
	}
}

//legal() makes sure that a proposed length of race is valid
bool legal (int distance) {

	//if-else loop returns true if length is valid, false otherwise
	if (distance == 500 || distance == 1000|| distance == 1500||
		distance == 3000|| distance == 5000|| distance == 10000) {
		return true;
	} else {
		return false;
	}
}

//runs a single race with 2 contestants over the specified distance
void race (int distance, int lap) {
	//declare (and initialize) variables
	int laps =  ceil((float) distance / (float) lap);	//number of laps
	int inInt;						//variable for storing integer input
	float inFloat, tempFloat;		//variables for storing float input

	//let the user know what the race parameters are
	cout << "\nDa dette løpet er " << distance << " m langt, vil det bli "
		<< laps << " passeringer.\n";

	//runner structure, contains the variables needed to define our runners
	struct runner {

	int num;		//variable to store the runner's starting number
	int laps;		//variable to store the number of completed laps

	float elapsed;	//variable to store the runner's elapsed time

	};

	//declare struct-based variables
	runner runner1;			//structs for our two runners
	runner runner2;
	runner1.num = 1;		//set starting numbers for both runners
	runner2.num = 2;
	runner1.laps = 0;		//initialize laps run before starting
	runner2.laps = 0;
	runner1.elapsed = 0;	//initialize and set time elapsed before starting
	runner2.elapsed = 0;

	//while loop keeps going until both runners have finshed their laps
	while (runner1.laps < laps || runner2.laps < laps) {

		//keeps asking for lap times until both runners are done
		while (true) {
			//asks what runner a time should be noted for
			cout << "\nPassering av løper nummer (1-2):";
			cin >> inInt;	//recieves the user's choice

			//if-else loop adheres to the user's choice
			if (inInt == 1) {	//handles adding lap times for runner 1
				
				//makes sure the runner isn't finished already
				if (runner1.laps == laps) {
					cout << "\nLøper 1 er allerede i mål!";
				} else {	//adds time and laps to the runner's stats
					//declare variables
					int inMin, inSec, inHun;	//for recieving the timestamp

					//while loop keeps going until broken by a valid time
					while (true) {
						//asks for and recieves a timestamp
						cout << "\nPasseringstid (mm ss hh): ";
						cin >> inMin >> inSec >> inHun;
						
						//converts our timestamp to a workable float
						inFloat = timeToFloat (inMin, inSec, inHun);
						
						//if-else loop makes sure we type in valid times
						if (inFloat >= (runner1.elapsed + 8)) {

							//calculates and stores the last laptime for print
							tempFloat = inFloat - runner1.elapsed;
							break;	//leaves the while loop
						} else {
							cout << "\nUgyldig tid, prøv igjen\n";
						}
					}

					//prints out the time of the runner's last lap
					cout << "Siste rundetid: ";
					floatToTime(tempFloat);
					cout << "\n\n";

					//updates the tracked stats in the runner1 struct
					runner1.elapsed = inFloat;
					runner1.laps++;

					//if loop checks if runner has finished the race
					if (runner1.laps == laps) {
						//prints out the final time of the runner
						cout << "\nMÅLPASSERING: Løper 1! ";
						floatToTime(runner1.elapsed);
						cout << "\n\n";
					}
				}
			} else if (inInt == 2) {	//handles adding lap times for runner 2

				//makes sure the runner isn't finished already
				if (runner2.laps == laps) {
					cout << "\nLøper 2 er allerede i mål!";
				} else {	//adds time and laps to the runner's stats
					//declare variables
					int inMin, inSec, inHun;	//for recieving the timestamp

					//while loop keeps going until broken by a valid time
					while (true) {
						//asks for and recieves a timestamp
						cout << "\nPasseringstid (mm ss hh): ";
						cin >> inMin >> inSec >> inHun;

						//converts our timestamp to a workable float
						inFloat = timeToFloat (inMin, inSec, inHun);
						
						//if-else loop makes sure we type in valid times
						if (inFloat >= (runner2.elapsed + 8)) {
							cout << inFloat;

							//calculates and stores the last laptime for print
							tempFloat = inFloat - runner2.elapsed;
							break;	//leaves the while loop
						} else {
							cout << "\nUgyldig tid, prøv igjen\n";
						}
					}
					
					//prints out the time of the runner's last lap
					cout << "Siste rundetid: ";
					floatToTime(tempFloat);
					cout << "\n\n";

					//updates the tracked stats in the runner2 struct
					runner2.elapsed = inFloat;
					runner2.laps++;

					//if loop checks if runner has finished the race
					if (runner2.laps == laps) {
						//prints out the final time of the runner
						cout << "\nMÅLPASSERING: Løper 2! ";
						floatToTime(runner2.elapsed);
						cout << "\n\n";
					}
				}
			}

			//if-loop makes sure the user types a valid number. leaves loop
			//if valid, otherwise re-runs it
			if (!(inInt == 1 || inInt == 2)) {
				cout << "\nUgyldig løper, prøv igjen\n";
			} else { break; }	//leaves the while-loop
		}
		
	}

	//if-else loop decides who the winner is, and prints the result
	if (runner1.elapsed < runner2.elapsed) {
		cout << "\nLøper 1 vinner med tiden ";
		floatToTime(runner1.elapsed);
		cout << "\n\n";
	} else if (runner1.elapsed > runner2.elapsed) {
		cout << "\nLøper 2 vinner med tiden ";
		floatToTime(runner2.elapsed);
		cout << "\n\n";
	} else if (runner1.elapsed == runner2.elapsed) {
		cout << "\nVinner må avgjøres på målfoto! ";
		floatToTime(runner1.elapsed);
		cout << "\n\n";
	}
	cout << "\n";

}

//asks user whether the program should be terminated or rerun
bool rerun () {
	//declare variables
	char again;	//variable for storing char input

	cout << "\n\nØnsker du å kjøre igjen? (J/N)\n";

	while (true) {	//asks for a char until a valid one is given
		cin >> again;
		again = toupper(again);

		//if-else loop makes sure we are given a valid char input
		if (again == 'J') {
			return false;	//exits loop; causes program to re-run
		} else if (again == 'N') {
			return true;	//exits loop; causes program to terminate
		} else {	//berates user for answering incorrectly
			cout << "\n\nVennligst tast J eller N!\n";
		}
	}
}

//handily converts input times from our program into a float we can work with
float timeToFloat (int m, int s, int h) {
	//declare variables
	float min = m;
	float sec = s;
	float hun = h;

	//simple math equations turns the time into a float measure of seconds
	float seconds = (hun / 100) + sec + (min*60);
	return seconds;	//returns the time as a float value
}

//prints out a timestamp based on a float number
void floatToTime (float s) {
	//declare variables
	int min, sec, hun;

	//simple maths dissect the float into minutes, seconds and hundredths
	min = s;
	hun = (ceil((s - min)*100));
	min = min / 60;
	sec = s - (min*60);

	//the timestamp is printed out
	cout << min << " " << sec << " " << hun;
}