School Stuff 10

#include <iostream>

using namespace std;

void advance(int& timeHr, int& timeMin, int minutes);   //by minutes
void advance(int& timeHr, int& timeMin, int hours, int minutes);    //by hours and minutes
void advance(int& timeHr, int& timeMin, double hours);  //by hours
void outputTime(int timeHr, int timeMin);

int main()
{
int timeHour, timeMinute, howAdvance, hours, minutes;
double hoursNfrac;

cout<<"Enter time (hour and minute) as two integers seperated by a space \n : ";
cin>>timeHour>>timeMinute;

cout<<"Time entered is ";
outputTime(timeHour,timeMinute);

cout<<endl;

cout<<"Choose how you would like to advance clock \n"<<"(1) By minutes \n(2) By hours and minutes \n(3) by hours \n :";
cin>>howAdvance;

switch(howAdvance)
{
case 1:
    cout<<"Enter minutes : ";
    cin>>minutes;
    advance(timeHour,timeMinute,minutes);
    break;

case 2:
    cout<<"Enter hours and minutes, seperated by a space : ";
    cin>>hours>>minutes;
    advance(timeHour,timeMinute,hours,minutes);
    break;

case 3:
    cout<<"Enter hours : ";
    cin>>hoursNfrac;
    advance(timeHour,timeMinute,hoursNfrac);
    break;

default:
    cout<<"Invalid choice \n";
}

cout<<"Updated time : ";
outputTime(timeHour,timeMinute);
cout<<endl;
return 0;
}

//
//Advance time by minutes
//
void advance (int& timeHr,int& timeMin,int minutes)
{
    int extraHrs=(timeMin+minutes)/60;
    timeMin=(timeMin+minutes)%60;
    timeHr=(timeHr+extraHrs)%24;
}

//
//Advance time by hours and minutes
//
void advance(int& timeHr,int& timeMin,int hours, int minutes)
{
    advance(timeHr,timeMin,hours*60 + minutes);
}

//
//Advance time by hours (including,possibility,fractions of hours)
//
void advance(int& timeHr,int& timeMin, double hours)
{
    int mins=int(hours*60 + 0.5);
    advance(timeHr,timeMin,mins);
}

//
//Display time as two integers separated by a colon
//Insert a leading zero when the minutes value is less than 10
//
void outputTime(int timeHr,int timeMin)
{
    cout<<timeHr<<":";
    if(timeMin<10)
        cout<<"0";
        cout<<timeMin;
}