Question

Write a menu driven program(based on user's choice)
a) find factorial of a number and
b) To check the number is prime number or not.​

Answer 1

Answer:

public class Factorial {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int choice = sc.nextInt();

switch(choice){

case 1:

int num = sc.nextInt();

long factorial = 1;

for(int i = 1; i <= num; ++i)

{

// factorial = factorial * i;

factorial *= i;

}

System.out.printf("Factorial =" + factorial);  break;

case 2:

int num, i, count=0;

System.out.print("Enter a Number : ");

num = sc.nextInt();

for(i=2; i<num; i++)

{

if(num%i == 0)

{

count++;

break;

}

}

if(count == 0)

{

System.out.print("This is a Prime Number");

}

else

{

System.out.print("This is not a Prime Number");

} break;

}

}

}