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NcrAndNpr.java

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class NcrAndNpr

{

double fact(double n)

{

int i=1;

double fact=1;

while(i<=n)

{

fact=fact*i;

i++;

}

return fact;

}

double permutation(int n,int r )

{

double per=fact(n)/fact(n-r);

return per;

}

double combination(int n,int r)

{

double com=fact(n)/(fact(n-r)*fact(r));

return com;

}

public static void main(String arg[])

{

NcrAndNpr p=new NcrAndNpr( );

Scanner sc=new Scanner(System.in);

System.out.println("enter value of n");

int n=sc.nextInt();

System.out.println("enter value of r");

int r=sc.nextInt();

if(n>=r)

{

System.out.println("The value of "+n+"p"+r+" is : "+p.permutation(n,r));

System.out.println("The value of "+n+"c"+r+" is : "+p.combination(n,r));

}

else

System.out.println("n value should be greater than or equals to r value");

}

}