Question

write a program in java to enter a number and check whether it. is prime or composite(check via factors)

Answer 1

a=number to be checked

rem=remainder,c=no of factors,f=loop variable for finding factors.

if c=2(no of factors) means it is a prime no because every prime no is divisible by one and the no itself only and a composite number always has other  factors leaving 1 and the number itself resulting in more than two factors always.

PROGRAM CODE:-

import java.util.*;

public class prime_no

{

public static void main(String args[])

{

Scanner sc=new Scanner(System.in);

int a,rem=0,f=0,c=0;

System.out.println("enter a no");

a=sc.nextInt();

for(f=1;f<=a;f++)

if(a%f==0)

c=c+1;

{

if(c==2)

System.out.println("it is a prime no");

else

System.out.println("it is composite no");

}

}

}

Answer 2

Answer:

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