Найти временной промежуток в часах, минутах и секундах

#include <iostream>
 
using namespace std;
 
int main(){
    
    int h1, m1, s1; 
    cout << "Íà÷àëî:" << endl;
    do{
        cout << "h1 = ";
        cin >> h1;
    }while(h1 < 0 || 24 < h1);
    do{
        cout << "m1 = ";
        cin >> m1;
    }while(m1 < 0 || 60 < m1);
    do{
        cout << "s1 = ";
        cin >> s1;
    }while(s1 < 0 || 60 < s1);
    
    int total1 = h1*60*60 + m1*60 + s1;
    
    int h2, m2, s2;
    cout << "Êîíåö:" << endl;
    do{
        cout << "h2 = ";
        cin >> h2;
    }while(h2 < 0 || h1 < h2);
    do{
        cout << "m2 = ";
        cin >> m2;
    }while(m2 < 0 || total1 < m2*60 + h2*60*60);
    do{
        cout << "s2 = ";
        cin >> s2;
    }while(s2 < 0 || total1 < s2 + m2*60 + h2*60*60);
    
    int total2 = h2*60*60 + m2*60 + s2;
    
    cout << h1 << ':' << m1 << ':' << s1 << endl;
    cout << h2 << ':' << m2 << ':' << s2 << endl;
    cout << (total1 - total2)/(60*60) << "h" << endl;
    cout << (total1 - total2)/60 << "m" << endl;
    cout << total1 - total2 << "s" << endl;
}