while

 #include<iostream>

using namespace std;

int main()

{ int i,f,sum,j;

j=1;

sum=1;

cout<<"enter factorial  no. = ";

cin>>f;

cout<<"facotorial numbers are:"<<endl;

i=f;

do{

cout<<i<<"*";

i--;

}while(i>1);

do{

sum=sum*j;

j++;

}while(j<=f);

cout<<"1"<<endl;

cout<<"--------factorial no. is--------- = "<<sum;

}