Factorial of a number - C++

Program :
#include<iostream>
using namespace std;
int fr(int n);
   
int main()
{
 int n,fact=1,c,f,k=1;
 cout<<"Enter the number:";
 cin>>n;
 while(k==1)
 {
   cout<< "MENU\n\n1.USING ITERATION\n\n2.USING RECURSION\n\n3.EXIT\n\nENTER YOUR CHOICE:";
   cin>>c;
   switch(c)
    {
 
        case 1: if(n==0)
                cout<<"Factorial of 0 is 1";
               else
                 {
                 for(int i=1;i<=n;++i)
                    fact=fact*i;
                 cout<<"\nfactorial= "<<fact<<"\n\n";
                 }
                 break;
         case 2: f=fr(n);
                 cout<<"\nfactorial="<<f<<"\n\n";
                 break;
         case 3:k=0;
                break;
                
        default:cout<<"\nInvalid choice";
                break;
      }
   }
 return 0;
  
 }
 int fr(int n)
 {
   if(n==0)
    return 1;
   else
    return (n*fr(n-1));
  }

Output:
students@cselab-desktop:~$ g++ fact.cpp
students@cselab-desktop:~$ ./a.out
Enter the number:5
MENU

1.USING ITERATION

2.USING RECURSION

3.EXIT

ENTER YOUR CHOICE:1

factorial= 120

MENU

1.USING ITERATION

2.USING RECURSION

3.EXIT

ENTER YOUR CHOICE:2

factorial=120

MENU

1.USING ITERATION

2.USING RECURSION

3.EXIT

ENTER YOUR CHOICE:3
students@cselab-desktop:~$

Operating Systems - Gary Nutt - Presentation Slides

Operating Systems

Gary Nutt

Visit SPELMAN COLLEGE website for the pdf files.

Download page for pdf.

Visit GORDON COLLEGE WEBSITE website for the ppt files.

Download page for ppt.



Chap 01-Intoduction


Chap02-Using the Operating System


Chap 03-Operating System Organisatiom


Chap 04-Computer Organisation


Chap05-Device Management


Chap06-Implementing Processes Threads Resources


Chap07-Scheduling


Chap08-Basic Synchronisation Principles


Chap09-High Level Synchronisation IPC


Chap10-Deadlock


Chap11-Memory Management


Chap11-Memory Management


Chap12-Virtual Memory


Chap13-File Management


Chap14-Protection Security


Chap15-Networks


Chap16-Remote Files


Chap17-Distibuted Computing


Chap18-Distributed Programming Runtime Systems


Chap19-Design Strategies


Chap20-TheLinuxKernel


Chap21-WindowsKernel


workshop_1


workshop_2