Input number and check prime or not using for loop in Java
for Loop - Question 10
In this question, we will see how to input a number and check if it is a prime number or not in Java programming using for loop. To know more about for loop click on the for loop lesson.
Q10) Write a program in Java to input a number and check if it is a prime number or not using for loop.
Program
import java.util.Scanner;
public class Q10
{
public static void main(String args[])
{
int i,n,fc=0;
Scanner sc=new Scanner(System.in);
System.out.print("Enter a number ");
n=sc.nextInt();
for(i=1; i<=n; i=i+1)
{
if(n%i==0)
{
fc=fc+1; // counting the factors of the given number
}
}
if(fc==2) // a prime number has only two factors
{
System.out.print("Prime Number");
}
else
{
System.out.print("Not Prime Number");
}
}
}Output
Enter a number 17 Prime Number
