Function Practice(Defination of time difference function)

#include <iostream.h>
int hour(int,int,int);
int minits(int,int,int);
int seconds(int,int,int);
int main()
{
    int hours=0,hours1=0;
    int mints=0,mints1=0;
    int second=0,second1=0;
    char chang=' ';
    cout <<"Enter Hours Of The First Time : ";
    cin >>hours;
    cout <<"\n\nEnter minits of first time : ";
    cin>>mints;
    cout<<"\n\nEnter seconds of the first time : ";
    cin>>second;
    cout <<"Enter Hours Of The second Time : ";
    cin >>hours1;
    cout <<"\n\nEnter minits of second time : ";
    cin>>mints1;
    cout<<"\n\nEnter seconds of the second time : ";
    cin>>second1;
    hours=hours-hours1;
    mints=mints-mints1;
    second=second-second1;
    cout <<"\n\nnow enter how you want the difference \n\th for difference in hours \n\tm for difference in minuts \n\ts for difference in seconds \n\t = ";
    cin >>chang;
    switch (chang)
    {
        case 'h':
            cout <<hour(hours,mints,second);
            break;
        case 'm':
            cout <<minits(hours,mints,second);
            break;
        case 's':
            cout <<seconds(hours,mints,second);
            break;
        default :
            cout <<"\n\n wrong entry ";
    }
    return 0;
}
int hour(int h,int m,int s)
{
    m=m/60;
    s=s/(60*60);
    h=h+m+s;
    return h;
}
int minits(int h,int m,int s)
{
    h=h*60;
    s=s/60;
    m=m+h+s;
    return m;
}
int seconds(int h,int m,int s)
{
    h=h*60*60;
    m=m*60;
    s=s+h+m;
    return s;
}