Write a program in Java to input a number and check if it is prime or not
Prime Number : A number that is divisible only by itself and 1 (e.g. 2, 3, 5, 7, 11).
import java.util.Scanner;
public class Prime {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter A Positive Number : ");
int num=sc.nextInt();
sc.close();
boolean isPrime=true;
if (num==1) {
System.out.print(" 1 Is Unitary");
} else if(num==2) {
System.out.print(" 2 Is Prime Number");
}else {
for (int i = 2; i < num/2; i++) {
if (num%i==0) {
isPrime=false;
break;
}
}
if (isPrime) {
System.out.print(num +" Is Prime Number");
} else {
System.out.print(num +" Is Not Prime Number");
}
}
}
}
OUTPUT
1.
Enter A Positive Number : 45
45 Is Not Prime Number
2.
Enter A Positive Number : 47
47 Is Prime Number
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