problem in converting decimal to hexadecimal

Question

while(dec3>0)
{R=dec3%16;
if(R>9)
{
switch (R) {
case 10: cout << "A";
break;
case 11: cout << "B";
break;
case 12: cout << "C";
break;
case 13: cout << "D";
break;
case 14: cout << "E";
break;
case 15: cout << "F";
break;}}
else
{
cout<<R;}
R/16;} but not correct output

Answer 1

https://proprogramming.org/wp-content/uploads/2015/03/dectohex.c

Answer 2

see this thread from today https://www.sololearn.com/discuss/388233/?ref=app
and my example
https://code.sololearn.com/cvnT36tvdWyw/?ref=app