Journal Program 11

 #include<iostream.h>

#include<conio.h>

#include<stdio.h>

#include<process.h>

class Factorial

{

int i,fact,n;

public:

Factorial()

{

cout<<"\n Enter value of n : ";

cin>>n;

}

void for_fact()

{

fact=1;

for(i=1;i<=n;i++)

{

fact=fact * i;

}

cout<<"\n "<<n<<"! = "<<fact;

}

void do_fact()

{

fact=1;

i=1;

do

{

   fact = fact * i;

   i++;

}while(i<=n);

cout<<"\n "<<n<<"! = "<<fact;

}

void while_fact()

{

fact=1;

i=1;

while(i<=n)

{

fact=fact*i;

i++;

}

cout<<"\n "<<n<<"! = "<<fact;

}

};

int main()

{

clrscr();

int choice;

char ch;

Factorial obj1;

do

{

cout<<endl<<"1:Factorial using For Loop ";

cout<<endl<<"2:Factorial using Do..While Loop ";

cout<<endl<<"3:Factorial using While Loop ";

cout<<endl<<"4:Exit";

cout<<endl<<"\nEnter your choice=";

cin>>choice;

switch(choice)

{

case 1:

obj1.for_fact();

break;

case 2:

obj1.do_fact();

break;

case 3:

obj1.while_fact();

break;

case 4:

exit(0);

break;

default:

cout<<endl<<"Invalid choice";

}

cout<<"\nDo you want to cont...";

cin>>ch;

}while(ch=='y'||ch=='Y');

return 0;

}