Function and Method Basic practice problems

Question: Write a function that takes two numbers as input and returns their sum.
Ans:

package HelloWorld;

import java.util.*;

class PrimeN {

public static int sumN(int a, int b) {

int sum = a + b;

return sum;

}

public static void main (String [] args) {

Scanner scan = new Scanner(System.in);

int a = scan.nextInt();

int b = scan.nextInt();

int result = sumN(a, b); // yaha hamne ek result name ka int type ka variable banaya

System.out.println(result);

}

}

Question: Create a function that calculates the factorial of a given number using a loop.
Ans:

package HelloWorld;

import java.util.*;

class PrimeN {

public static int factorialN(int n) {

int f = 1;

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

f= f * i;

}return f;

}

public static void main (String [] args) {

Scanner scan = new Scanner(System.in);

int n = scan.nextInt();

int result = factorialN(n);

System.out.println(result);

}

}

Question: