DisplayDayName.cpp

#include<iostream>
using namespace std;
int main ()
{   int day;
    cout<<"Enter Day Number ";
    cin>>day;

switch(day)
{
    case 1: cout<<"Mon ";
    break;
    case 2: cout<<"Tue ";
    break;
    case 3: cout<<"Wed ";
    break;
    case 4: cout<<"Thu ";
    break;
case 5: cout<<" Fri";
    break;
case 6: cout<<"Sat ";
    break;
case 7: cout<<"Sun ";
    break;
    default: cout<<"Invalid day";

}
}