C++ Program
#include <iostream> void main() { clrscr(); int hours,mins,seconds,x; cout<>hours; cout<>mins; cout<>seconds; if(hours > 24) { cout<<"Invalid Entery"; } else { cout<<"\n24 Hours Format\n"; cout<<"Hours : Mins : Seconds\n"<<" "<<hours<<" : "<<mins<<" : "<<seconds< 12) { hours=hours-12; cout<<"12 Hours Format\n"; cout<<"Hours : Mins : Seconds\n"<<" "<<hours<<" : "<<mins<<" : "<<seconds; } else { cout<<"12 Hours Format\n"; cout<<"Hours : Mins : Seconds\n"<<" "<<hours<<": "<<mins<<" : "<<seconds; } } } // end of main