Hello friends can you guys tell me what’s wrong with my code in both side it will print this is prime number thank u

Question

public class Program
{
public static void main(String[] args) {

int Number=7;
int x=0;
for(int i=2; i<=-1;i++)
{
if(Number%i==0)

x=x+1;

}

if(x>0){
System.out.println("The number is not prime");
}

else{
System.out.println("The number is Prime");
}

}
}

Answer 1

Well, in the for loop you wrote in the condition i <= -1, instead of i <= Number - 1; and that kind of never executes the loop so x stays 0 and it will print that its a prime.
Also, the code is not perfect, because this will register 1 as a prime number, which isn't.
You should do it like this:

for (int i = 1; i <= Number; i++) {
if (Number % i == 0)
x++;
}
if (x == 2) {
System.out.println("Prime");
} else if (x == 1) {
System.out.println("1");
} else if (x == 0) {
System.out.println("Negative number");
} else {
System.out.println("Not Prime");
}