what is do while function give a program for it

Answer 1

A do/while loop functions exactly the same as a regular while loop. The only difference is, is that a do/while loop is always garunteed to run at least once.

Syntax:

do
{
//loop code
} while (/*condition*/);

Answer 2

#include<iostream>
using namespace std;
int main()
{
int i,n;
n=4;
i=0;
do
{
cout<<n;
i++;
}
while(i<n);
}