Go4Expert - Help me

I have written a program for factorial in recursive and i am not able get how the program work.
The program is as follows

Code:

#include<iostream.h>

main()

{

int fact(int m);

unsigned long int f;

cout<<"enter the no. "<<endl;

int n;

cin>>n;

f = fact(n);

cout<<"factorial of the no. is  "<<f<<endl;

}

int fact(int m)

{

unsigned long int f=1;

if(m==0|m==1)

return(m);

else

{

cout<<"before m = "<<m<<endl;

f=m*fact(m-1);

cout<<"after m = "<<m<<endl<<"fact(m-1) =  "<<fact(m-1)<<endl;

cout<<"f = "<<f<<endl;

return(f);

}

}

I am getting out put like this. Can any one explain me why i am getting like this
enter the no.
3
before m = 3
before m = 2
after m = 2
fact(m-1) = 1
f = 2
before m = 2
after m = 2
fact(m-1) = 1
f = 2
after m = 3
fact(m-1) = 2
f = 6
factorial of the no. is 6