In Java programming, $//$ A simple sample of recursion

class Factorial

$\{$

$//$ This is a recursive function.

int factR$($int n$)$

$\{$

int result;

if$($n $==1)$ return $1$;

result $=$ factR$($n$-1)*$ n; $//$ Execute the recursive call to factR$()$

return result;

$\}$

$//$ This is a iterative equivalent.

int factI$($int n$)$

$\{$

int t$,$ result;

result $=1$;

for$($t $=1$; t $<=$ n; t$++)$ result $*=$ t;

return result;

$\}$

$\}$

class Recursion

$\{$

public static void main$($String args$[])$

$\{$

Factorial f $=$ new Factorial$()$;

System.out.println$("$Factorials using recursive method."$)$;

System.out.println$("$Factorial of $3$ is $"+$ f$.$factR$(3))$;

System.out.println$("$Factorial of $4$ is $"+$ f$.$factR$(4))$;

System.out.println$("$Factorial of $5$ is $"+$ f$.$factR$(5))$;

System.println$()$;

System.out.println$("$Factorials using iterative method."$)$;

System.out.println$("$Factorial of $3$ is $"+$ f$.$factI$(3))$;

System.out.println$("$Factorial of $4$ is $"+$ f$.$factI$(4))$;

System.out.println$("$Factorial of $5$ is $"+$ f$.$factI$(5))$;

System.println$()$;

$\}$

$\}$ A$.$ Explain the functionality of local variables and parameters in a recursive call.

B$.$ Explain the functionality of parameters in each recursive call.