Learn C++ step by step(2)

// using dev c++ under winxp

#include <iostream>
#include <cstdlib>

using namespace std; //standard c++ style about namespace

//define adt time

class time
{
public:
    time(); //default constructor
   
    void settime(int,int,int);//set time for hours,minutes,seconds
   
    void printmilitary(void);//print time using army's style
   
    void printstandard(void);//print time using standart style
   
private:

    int hour; //0-23
  
    int minute;//0-59
   
    int second;//0-59
};

//constructor time() initionalize every variable to 0
time::time(void)
{
    hour=minute=second=0;
}

//set time
void time::settime(int h,int m,int s)
{
    hour=(h>=0&&h<24)?h:0;
    minute=(m>=0&&m<=59)?m:0;
    second=(s>=0&&s<=59)?s:0;
}

//print using army's style
void time::printmilitary(void)
{
    cout<<(hour<10?"0":"")<<hour<<":"
    <<(minute<10?"0":"")<<minute<<":"
    <<(second<10?"0":"")<<second<<endl;
}

//print using standard style
void time::printstandard(void)
{
    cout<<((hour==0||hour==12)?12:hour%12)<<":"
    <<(minute<10?"0":"")<<minute<<":"
    <<(second<10?"0":"")<<second
    <<(hour<12?"am":"pm")<<endl;
}
   
//testing for simple class time

int main(void)
{
    time t;
   
    cout<<"the initial military time is:";
    t.printmilitary();   
    cout<<"\nthe initial standard time is:";
    t.printstandard();
   
    t.settime(13,27,6);
   
    cout<<"\n\nmilitary time after set time is:";
    t.printmilitary();
    cout<<"\n\nstandard time after set time is:";
    t.printstandard();
   
    t.settime(99,99,99);
   
    cout<<"\n\nafter attempting invalid settings:\n"
        <<"military time is:";
    t.printmilitary();
    cout<<"standard time is:";
    t.printstandard();
   
    cout<<endl;
   
    system("pause");
   
    return(0);
}